[BLB] Implement forage mechanic (#12569)

* [BLB] Implement Corpseberry Cultivator

* [BLB] Implement Thornvault Forager

* fix verify failure

Mage/src/main/java/mage/abilities/common/ForageTriggeredAbility.java

@@ -0,0 +1,41 @@
+package mage.abilities.common;
+
+import mage.abilities.TriggeredAbilityImpl;
+import mage.abilities.effects.Effect;
+import mage.constants.Zone;
+import mage.game.Game;
+import mage.game.events.GameEvent;
+
+/**
+ * @author TheElk801
+ */
+public class ForageTriggeredAbility extends TriggeredAbilityImpl {
+
+    public ForageTriggeredAbility(Effect effect) {
+        this(Zone.BATTLEFIELD, effect, false);
+    }
+
+    public ForageTriggeredAbility(Zone zone, Effect effect, boolean optional) {
+        super(zone, effect, optional);
+        setTriggerPhrase("Whenever you forage, ");
+    }
+
+    private ForageTriggeredAbility(final ForageTriggeredAbility ability) {
+        super(ability);
+    }
+
+    @Override
+    public ForageTriggeredAbility copy() {
+        return new ForageTriggeredAbility(this);
+    }
+
+    @Override
+    public boolean checkEventType(GameEvent event, Game game) {
+        return event.getType() == GameEvent.EventType.FORAGED;
+    }
+
+    @Override
+    public boolean checkTrigger(GameEvent event, Game game) {
+        return isControlledBy(event.getPlayerId());
+    }
+}

Mage/src/main/java/mage/abilities/costs/common/ForageCost.java

@@ -0,0 +1,43 @@
+package mage.abilities.costs.common;
+
+import mage.abilities.Ability;
+import mage.abilities.costs.Cost;
+import mage.abilities.costs.OrCost;
+import mage.filter.StaticFilters;
+import mage.game.Game;
+import mage.game.events.GameEvent;
+import mage.target.common.TargetCardInYourGraveyard;
+
+import java.util.UUID;
+
+/**
+ * @author TheElk801
+ */
+public class ForageCost extends OrCost {
+
+    public ForageCost() {
+        super(
+                "forage",
+                new ExileFromGraveCost(new TargetCardInYourGraveyard(3)),
+                new SacrificeTargetCost(StaticFilters.FILTER_CONTROLLED_FOOD)
+        );
+    }
+
+    private ForageCost(final ForageCost cost) {
+        super(cost);
+    }
+
+    @Override
+    public ForageCost copy() {
+        return new ForageCost(this);
+    }
+
+    @Override
+    public boolean pay(Ability ability, Game game, Ability source, UUID controllerId, boolean noMana, Cost costToPay) {
+        if (!super.pay(ability, game, source, controllerId, noMana, costToPay)) {
+            return false;
+        }
+        game.fireEvent(GameEvent.getEvent(GameEvent.EventType.FORAGED, source.getSourceId(), source, controllerId));
+        return true;
+    }
+}

Mage/src/main/java/mage/game/events/GameEvent.java

@@ -662,6 +662,12 @@ public class GameEvent implements Serializable {
          playerId   owner of the plotted card (the one able to cast the card)
          */
         BECOME_PLOTTED,
+        /* the player foraged
+         targetId   same as sourceId
+         sourceId   of the ability
+         playerId   player who foraged
+         */
+        FORAGED,
         //custom events
         CUSTOM_EVENT
     }