Add logic so that the AI will play Sylvan Library

forge-gui-desktop/src/test/java/forge/ai/AIIntegrationTests.java

@@ -113,4 +113,74 @@ public void testDoesNotCastRepopulateWhenNoCreaturesInOpponentGraveyard() {
 
         AssertJUnit.assertTrue("Repopulate must still be in hand", hand.contains(repopulate));
     }
+
+    @Test
+    public void testSylvanLibraryCanBeCast() {
+        // Test that the AI will cast Sylvan Library when it has mana available
+        Game game = initAndCreateGame();
+        Player p = game.getPlayers().get(1);
+        p.setTeam(0);
+        addCard("Forest", p);
+        addCard("Forest", p);
+        addCardToZone("Sylvan Library", p, ZoneType.Hand);
+
+        Player opponent = game.getPlayers().get(0);
+        opponent.setTeam(1);
+
+        // Fill decks with cards
+        for (int i = 0; i < 60; i++) {
+            addCardToZone("Island", opponent, ZoneType.Library);
+            addCardToZone("Forest", p, ZoneType.Library);
+        }
+
+        this.playUntilPhase(game, PhaseType.END_OF_TURN);
+
+        // Sylvan Library should be on the battlefield
+        AssertJUnit.assertEquals("Sylvan Library should be on the battlefield", 1, countCardsWithName(game, "Sylvan Library"));
+    }
+
+    @Test
+    public void testSylvanLibraryAtLowLifeActsLikeMirrisGuile() {
+        // Test that when at low life, the AI uses Sylvan Library to look at cards
+        // but puts them back instead of paying life (like Mirri's Guile)
+        Game game = initAndCreateGame();
+        Player p = game.getPlayers().get(1);
+        p.setTeam(0);
+        p.setLife(5, null); // Low life - can't afford to pay 4 life
+
+        addCard("Sylvan Library", p);
+        // Add lands so the AI has mana to cast things
+        addCard("Forest", p);
+        addCard("Forest", p);
+        addCard("Forest", p);
+        addCard("Forest", p);
+        addCard("Forest", p);
+
+        Player opponent = game.getPlayers().get(0);
+        opponent.setTeam(1);
+
+        // Set up known library - first added goes on top (index 0)
+        // Library order after setup: Forest (top), Forest, Llanowar Elves (bottom of top 3)
+        // The AI draws 3 cards (1 normal + 2 from Sylvan Library cost)
+        // Then must choose 2 to return. Should keep Llanowar Elves (best) and return 2 Forests
+        addCardToZone("Forest", p, ZoneType.Library);         // Top (index 0)
+        addCardToZone("Forest", p, ZoneType.Library);         // Middle (index 1)
+        addCardToZone("Llanowar Elves", p, ZoneType.Library); // Bottom of top 3 (index 2) - best card
+
+        // Fill rest of deck
+        for (int i = 0; i < 57; i++) {
+            addCardToZone("Forest", p, ZoneType.Library);
+            addCardToZone("Island", opponent, ZoneType.Library);
+        }
+
+        // Play through to AI's next main phase (after draw step completes)
+        this.playUntilNextTurn(game);  // AI turn 0 -> Opponent turn
+        this.playUntilNextTurn(game);  // Opponent turn -> AI turn
+        this.playUntilPhase(game, PhaseType.MAIN1);  // Advance through DRAW to MAIN1
+
+        // The AI should still be at 5 life (didn't pay any life)
+        AssertJUnit.assertEquals("AI should not have paid life", 5, p.getLife());
+        // The AI should have 1 card in hand (kept the best, put 2 back)
+        AssertJUnit.assertEquals("AI should have 1 card in hand", 1, p.getZone(ZoneType.Hand).size());
+    }
 }

forge-gui/res/cardsfolder/s/sylvan_library.txt

@@ -2,9 +2,9 @@ Name:Sylvan Library
 ManaCost:1 G
 Types:Enchantment
 T:Mode$ Phase | Phase$ Draw | ValidPlayer$ You | TriggerZones$ Battlefield | Execute$ TrigDraw | TriggerDescription$ At the beginning of your draw step, you may draw two additional cards. If you do, choose two cards in your hand drawn this turn. For each of those cards, pay 4 life or put the card on top of your library.
-SVar:TrigDraw:AB$ ChooseCard | ChoiceZone$ Hand | Choices$ Card.YouOwn+DrawnThisTurn | Cost$ Draw<2/You> | Amount$ 2 | Mandatory$ True | AILogic$ Worst | SubAbility$ DBPayOrReturn | NoReveal$ True
+SVar:TrigDraw:AB$ ChooseCard | ChoiceZone$ Hand | Choices$ Card.YouOwn+DrawnThisTurn | Cost$ Draw<2/You> | Amount$ 2 | Mandatory$ True | AILogic$ WorstCard | SubAbility$ DBPayOrReturn | NoReveal$ True
 SVar:DBPayOrReturn:DB$ RepeatEach | RepeatCards$ Card.ChosenCard | Zone$ Hand | RepeatSubAbility$ DBReplace | SubAbility$ DBCleanup | ChooseOrder$ True
 SVar:DBReplace:DB$ ChangeZone | Origin$ Hand | Destination$ Library | ChangeType$ Card.ChosenCard | UnlessCost$ PayLife<4> | Mandatory$ True | UnlessPayer$ TriggeredPlayer | NoReveal$ True
 SVar:DBCleanup:DB$ Cleanup | ClearChosenCard$ True
-AI:RemoveDeck:All
+AI:RemoveDeck:Random
 Oracle:At the beginning of your draw step, you may draw two additional cards. If you do, choose two cards in your hand drawn this turn. For each of those cards, pay 4 life or put the card on top of your library.