[TLE] Implement Aang, A Lot to Learn

Mage/src/main/java/mage/abilities/condition/common/LessonsInGraveCondition.java

@@ -0,0 +1,45 @@
+package mage.abilities.condition.common;
+
+import mage.abilities.Ability;
+import mage.abilities.condition.Condition;
+import mage.abilities.dynamicvalue.common.CardsInControllerGraveyardCount;
+import mage.abilities.hint.Hint;
+import mage.abilities.hint.ValueHint;
+import mage.constants.SubType;
+import mage.filter.FilterCard;
+import mage.game.Game;
+import mage.players.Player;
+import mage.util.CardUtil;
+
+/**
+ * @author TheElk801
+ */
+public enum LessonsInGraveCondition implements Condition {
+    ONE(1),
+    THREE(3);
+    private final int amount;
+    private static final FilterCard filter = new FilterCard(SubType.LESSON);
+    private static final Hint hint = new ValueHint("Lesson cards in your graveyard", new CardsInControllerGraveyardCount(filter));
+
+    public static Hint getHint() {
+        return hint;
+    }
+
+    LessonsInGraveCondition(int amount) {
+        this.amount = amount;
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        Player player = game.getPlayer(source.getControllerId());
+        return player != null && player.getGraveyard().count(filter, game) >= this.amount;
+    }
+
+    @Override
+    public String toString() {
+        if (amount == 1) {
+            return "there's a Lesson card in your graveyard";
+        }
+        return "there are " + CardUtil.numberToText(this.amount) + " or more Lesson cards in your graveyard";
+    }
+}