Add 30 AKH card implementations

* Some of the cards still need testing. Will fix and problems and update tomorrow, but pushing them for now to make it clear what's been implemented so far.

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

@@ -0,0 +1,45 @@
+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;
+import mage.game.permanent.Permanent;
+
+/**
+ * @author stravant
+ */
+public class WheneverYouExertCreatureTriggeredAbility extends TriggeredAbilityImpl {
+
+    public WheneverYouExertCreatureTriggeredAbility(Effect effect) {
+        super(Zone.BATTLEFIELD, effect);
+    }
+
+    public WheneverYouExertCreatureTriggeredAbility(final WheneverYouExertCreatureTriggeredAbility ability) {
+        super(ability);
+    }
+
+    @Override
+    public boolean checkEventType(GameEvent event, Game game) {
+        return event.getType() == GameEvent.EventType.BECOMES_EXERTED;
+    }
+
+    @Override
+    public boolean checkTrigger(GameEvent event, Game game) {
+        boolean weAreExerting = getControllerId().equals(event.getPlayerId());
+        Permanent exerted = game.getPermanent(event.getTargetId());
+        boolean exertedIsCreature = (exerted != null) && exerted.isCreature();
+        return weAreExerting && exertedIsCreature;
+    }
+
+    @Override
+    public WheneverYouExertCreatureTriggeredAbility copy() {
+        return new WheneverYouExertCreatureTriggeredAbility(this);
+    }
+
+    @Override
+    public String getRule() {
+        return "Whenever you exert a creature, " + super.getRule();
+    }
+}

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

@@ -0,0 +1,22 @@
+package mage.abilities.condition.common;
+
+import mage.abilities.Ability;
+import mage.abilities.condition.Condition;
+import mage.game.Game;
+
+/**
+ * @author stravant
+ */
+public enum HeckbentCondition implements Condition {
+    instance;
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        return game.getPlayer(source.getControllerId()).getHand().size() <= 1;
+    }
+
+    @Override
+    public String toString() {
+        return "if you have one or fewer cards in hand";
+    }
+}

Mage/src/main/java/mage/filter/StaticFilters.java

@@ -16,6 +16,8 @@ import mage.filter.common.FilterCreatureSpell;
 import mage.filter.common.FilterNonlandCard;
 import mage.filter.predicate.Predicates;
 import mage.filter.predicate.mageobject.CardTypePredicate;
+import mage.filter.predicate.permanent.AttackingPredicate;
+import mage.filter.predicate.permanent.TokenPredicate;
 
 /**
  *
@@ -38,7 +40,15 @@ public final class StaticFilters {
 
     public static final FilterCreatureSpell FILTER_SPELL_A_CREATURE = new FilterCreatureSpell("a creature spell");
 
+    public static final FilterPermanent FILTER_CREATURE_TOKENS = new FilterCreaturePermanent("creature tokens");
+
+    public static final FilterPermanent FILTER_ATTACKING_CREATURES = new FilterCreaturePermanent("attacking creatures");
+
     static {
+        FILTER_CREATURE_TOKENS.add(new TokenPredicate());
+
+        FILTER_ATTACKING_CREATURES.add(new AttackingPredicate());
+
         FILTER_PERMANENT_ARTIFACT_OR_CREATURE.add(Predicates.or(
                 new CardTypePredicate(CardType.ARTIFACT),
                 new CardTypePredicate(CardType.CREATURE)