diff --git a/crates/mtgc-core/src/filters.rs b/crates/mtgc-core/src/filters.rs
index ac01cde..4f63b32 100644
--- a/crates/mtgc-core/src/filters.rs
+++ b/crates/mtgc-core/src/filters.rs
@@ -254,6 +254,10 @@ impl Catalog {
         let mut vals: Vec<Value> = Vec::new();
         push_card_filters(&mut sql, &mut vals, filter, self.has_universes_beyond, self.has_vanilla);
 
+        if filter.not_owned {
+            sql.push_str(" AND COALESCE(lc.quantity_owned, 0) = 0");
+        }
+
         sql.push_str(" ORDER BY oc.edhrec_rank IS NULL, oc.edhrec_rank, oc.name COLLATE NOCASE LIMIT ?");
         vals.push(Value::Integer(limit as i64));
 
@@ -765,6 +769,31 @@ mod tests {
         assert_eq!(bolt.quantity_owned, 0);
     }
 
+    #[test]
+    fn search_reference_not_owned_excludes_owned_cards() {
+        let fx = test_support::make();
+        let cat = &fx.catalog;
+        cat.add_owned("sol-ring", 1).unwrap();
+
+        let unowned = cat.search_reference(&LibraryFilter {
+            not_owned: true,
+            ..Default::default()
+        }, 50).unwrap();
+        assert!(!unowned.iter().any(|c| c.card.oracle_id == "sol-ring"));
+        // The other four fixture cards are all unowned and still show up.
+        assert_eq!(unowned.len(), 4);
+
+        // A card set to 0 owned (never actually acquired, or reset back to 0)
+        // counts as not-owned too, not just "no library_cards row at all".
+        cat.add_owned("lightning-bolt", 1).unwrap();
+        cat.set_owned("lightning-bolt", 0).unwrap();
+        let unowned = cat.search_reference(&LibraryFilter {
+            not_owned: true,
+            ..Default::default()
+        }, 50).unwrap();
+        assert!(unowned.iter().any(|c| c.card.oracle_id == "lightning-bolt"));
+    }
+
     #[test]
     fn search_reference_respects_limit() {
         let fx = test_support::make();
diff --git a/crates/mtgc-core/src/model.rs b/crates/mtgc-core/src/model.rs
index b35398b..622cb7d 100644
--- a/crates/mtgc-core/src/model.rs
+++ b/crates/mtgc-core/src/model.rs
@@ -341,6 +341,12 @@ pub struct LibraryFilter {
     pub power_max: Option<f64>,
     pub toughness_min: Option<f64>,
     pub toughness_max: Option<f64>,
+    /// Only cards with zero owned copies. Meaningless against
+    /// [`Catalog::search_library`] (which already only returns owned cards),
+    /// so it's only honored by [`Catalog::search_reference`] — the Card
+    /// Search tab's "Not owned" quick filter.
+    #[serde(default)]
+    pub not_owned: bool,
 }
 
 #[cfg(test)]
diff --git a/src/api.ts b/src/api.ts
index 2c142f5..38cec03 100644
--- a/src/api.ts
+++ b/src/api.ts
@@ -130,6 +130,9 @@ export interface LibraryFilter {
   power_max?: number | null;
   toughness_min?: number | null;
   toughness_max?: number | null;
+  /** Only cards with zero owned copies. Only honored by `searchReference`
+   *  (`searchLibrary` already returns owned cards exclusively). */
+  not_owned?: boolean;
 }
 
 export interface Status {
diff --git a/src/components.tsx b/src/components.tsx
index 4a0ead1..7cbaa1e 100644
--- a/src/components.tsx
+++ b/src/components.tsx
@@ -1332,6 +1332,7 @@ export function CardTile({
   cornerBottomLeft,
   footer,
   selected,
+  rotated,
 }: {
   card: CardRef;
   corner?: ReactNode;
@@ -1342,19 +1343,34 @@ export function CardTile({
   footer?: ReactNode;
   /** Highlights the tile and keeps `cornerLeft` visible without hovering. */
   selected?: boolean;
+  /** Caller wants Horizontal view — only actually rotates when `card.horizontal`
+   *  is also true, so mixed results (e.g. a set with both Sieges and normal
+   *  cards) don't spin the ones that are already right-side up. */
+  rotated?: boolean;
 }) {
   const { open } = useClickPreview();
+  const showRotated = !!rotated && card.horizontal;
   return (
-    <div className={`tile ${selected ? "tile-selected" : ""}`}>
-      <div className="tile-img-wrap">
+    <div className={`tile ${selected ? "tile-selected" : ""} ${showRotated ? "tile-rotated" : ""}`}>
+      <div className={showRotated ? "tile-img-wrap-rotated" : "tile-img-wrap"}>
         {card.image_uri ? (
-          <img
-            className="tile-img"
-            src={card.image_uri}
-            alt={card.name}
-            loading="lazy"
-            onClick={() => open(card)}
-          />
+          showRotated ? (
+            <img
+              className="tile-img-rotated"
+              src={card.image_uri}
+              alt={card.name}
+              loading="lazy"
+              onClick={() => open(card)}
+            />
+          ) : (
+            <img
+              className="tile-img"
+              src={card.image_uri}
+              alt={card.name}
+              loading="lazy"
+              onClick={() => open(card)}
+            />
+          )
         ) : (
           <div className="tile-noimg">{card.name}</div>
         )}
@@ -1456,6 +1472,14 @@ const ICON_BLANK_BOX = icon(
     <line x1="3" y1="9" x2="21" y2="9" />
   </>,
 );
+/** An open package — cards you don't have a copy of yet. */
+const ICON_PACKAGE = icon(
+  <>
+    <path d="M21 8l-9-5-9 5 9 5 9-5z" />
+    <path d="M3 8v8l9 5 9-5V8" />
+    <path d="M12 13v8" />
+  </>,
+);
 
 /**
  * Card-origin and numeric criteria shared by the Library and Card Search
@@ -1475,6 +1499,7 @@ export type CardCriteria = {
   legalIn: string;
   canBeCommander: boolean;
   vanillaOnly: boolean;
+  notOwned: boolean;
   powerMin: string;
   powerMax: string;
   toughMin: string;
@@ -1490,6 +1515,7 @@ export const EMPTY_CRITERIA: CardCriteria = {
   legalIn: "",
   canBeCommander: false,
   vanillaOnly: false,
+  notOwned: false,
   powerMin: "",
   powerMax: "",
   toughMin: "",
@@ -1521,6 +1547,7 @@ export function applyCardCriteria(c: CardCriteria): Partial<LibraryFilter> {
     legal_in: c.legalIn || null,
     can_be_commander: c.canBeCommander,
     vanilla_only: c.vanillaOnly,
+    not_owned: c.notOwned,
     power_min: num(c.powerMin),
     power_max: num(c.powerMax),
     toughness_min: num(c.toughMin),
@@ -1533,13 +1560,14 @@ export function applyCardCriteria(c: CardCriteria): Partial<LibraryFilter> {
  *
  * The three "exclude" toggles deliberately don't count: they refine a result
  * set rather than select one, so ticking "hide Un-sets" on its own shouldn't
- * make Card Search pull every card in the database. Choosing a format or a
- * power range is a real query, and does.
+ * make Card Search pull every card in the database. Choosing a format, a
+ * power range, or "not owned" is a real query, and does.
  */
 export function criteriaActive(c: CardCriteria): boolean {
   return (
     c.canBeCommander ||
     c.vanillaOnly ||
+    c.notOwned ||
     c.legalIn !== "" ||
     [c.priceMin, c.priceMax, c.powerMin, c.powerMax, c.toughMin, c.toughMax].some(
       (v) => v.trim() !== "",
@@ -1595,9 +1623,13 @@ function RangePair({
 export function CardCriteriaFields({
   value: c,
   onChange,
+  hideNotOwned,
 }: {
   value: CardCriteria;
   onChange: (patch: Partial<CardCriteria>) => void;
+  /** Omit the "Not owned" toggle — for the Library tab, which already shows
+   *  nothing but owned cards, so the filter would just be a no-op there. */
+  hideNotOwned?: boolean;
 }) {
   return (
     <>
@@ -1681,6 +1713,15 @@ export function CardCriteriaFields({
             on={c.vanillaOnly}
             onToggle={() => onChange({ vanillaOnly: !c.vanillaOnly })}
           />
+          {!hideNotOwned && (
+            <IconToggle
+              icon={ICON_PACKAGE}
+              label="Not owned"
+              hint="Only cards you don't have a single copy of yet."
+              on={c.notOwned}
+              onToggle={() => onChange({ notOwned: !c.notOwned })}
+            />
+          )}
         </div>
       </div>
     </>
diff --git a/src/styles.css b/src/styles.css
index 21347ab..b620682 100644
--- a/src/styles.css
+++ b/src/styles.css
@@ -2151,6 +2151,13 @@ tbody tr:hover {
   flex-direction: column;
   gap: 7px;
 }
+/* A rotated (landscape) card at a single portrait column's width renders
+   ~2x smaller in area than a normal tile (a 85:61 box is short as well as
+   narrow) — hard to read. Spanning 2 columns gives it a comparable, legible
+   footprint instead. */
+.tile-rotated {
+  grid-column: span 2;
+}
 .tile-img-wrap {
   position: relative;
 }
@@ -2166,6 +2173,37 @@ tbody tr:hover {
   transform: translateY(-3px);
   box-shadow: var(--shadow-md);
 }
+/* Horizontal view (see `CardTile`'s `rotated` prop): swaps the tile to a
+   landscape footprint via `aspect-ratio` — the width still comes from the
+   grid column, so no viewport math is needed here, unlike the click-preview
+   modal's rotated case. `container-type: size` lets the actual (still
+   portrait, pre-rotation) `<img>` inside reference that computed box via
+   `cqw`/`cqh` to size itself as the exact transpose, so rotating it 90° fills
+   the wrapper exactly. */
+.tile-img-wrap-rotated {
+  position: relative;
+  width: 100%;
+  aspect-ratio: 85 / 61;
+  container-type: size;
+  overflow: hidden;
+  border-radius: var(--radius-card);
+  box-shadow: var(--shadow-sm);
+  transition: transform var(--dur-fast), box-shadow var(--dur-fast);
+}
+.tile:hover .tile-img-wrap-rotated {
+  transform: translateY(-3px);
+  box-shadow: var(--shadow-md);
+}
+.tile-img-rotated {
+  position: absolute;
+  top: 50%;
+  left: 50%;
+  width: 100cqh;
+  height: 100cqw;
+  display: block;
+  cursor: zoom-in;
+  transform: translate(-50%, -50%) rotate(90deg);
+}
 .tile-noimg {
   aspect-ratio: 488 / 680;
   border: 1px solid var(--border);
diff --git a/src/views/CardSearch.tsx b/src/views/CardSearch.tsx
index 7494e95..2bde51c 100644
--- a/src/views/CardSearch.tsx
+++ b/src/views/CardSearch.tsx
@@ -79,6 +79,10 @@ export function CardSearch({
   const [groupBy, setGroupBy] = usePersistedState<GroupMode>("cardsearch-group", "none");
   const [sortBy, setSortBy] = usePersistedState<SortMode>("cardsearch-sort", "name");
   const [sortDir, setSortDir] = usePersistedState<SortDir>("cardsearch-sort-dir", "asc");
+  // Tiles-only: rotates cards that are actually horizontal (Battles, Planes,
+  // Phenomena) into their natural landscape orientation — handy when a search
+  // is mostly/entirely those. Cards that aren't horizontal are unaffected.
+  const [horizontalView, setHorizontalView] = usePersistedState("cardsearch-horizontal-view", false);
 
   useEffect(() => {
     api.listDecks().then(setDecks);
@@ -337,6 +341,7 @@ export function CardSearch({
             key={c.oracle_id}
             card={c}
             selected={selected.has(c.oracle_id)}
+            rotated={horizontalView}
             cornerLeft={
               <input
                 type="checkbox"
@@ -567,6 +572,21 @@ export function CardSearch({
             onToggleDir={() => setSortDir(sortDir === "asc" ? "desc" : "asc")}
           />
           <ViewToggle mode={view} onChange={setView} />
+          <label
+            className="row"
+            style={{ gap: 4, cursor: view === "tiles" ? "pointer" : "default", opacity: view === "tiles" ? 1 : 0.5 }}
+            title="Tiles view: rotate Battles, Planes, and Phenomena to their natural landscape orientation"
+          >
+            <input
+              type="checkbox"
+              checked={horizontalView}
+              onChange={(e) => setHorizontalView(e.target.checked)}
+              disabled={view !== "tiles"}
+            />
+            <span className="muted" style={{ fontSize: 12 }}>
+              Horizontal
+            </span>
+          </label>
         </div>
       </div>
 
diff --git a/src/views/LibraryBrowser.tsx b/src/views/LibraryBrowser.tsx
index feec117..8f816d5 100644
--- a/src/views/LibraryBrowser.tsx
+++ b/src/views/LibraryBrowser.tsx
@@ -632,7 +632,7 @@ export function LibraryBrowser({
             placeholder="e.g. landfall"
           />
         </div>
-        <CardCriteriaFields value={criteria} onChange={patchCriteria} />
+        <CardCriteriaFields value={criteria} onChange={patchCriteria} hideNotOwned />
         </div>
         </div>
         <button