[TDM] Implement Piercing Exhale

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

@@ -0,0 +1,26 @@
+package mage.abilities.condition.common;
+
+import mage.abilities.Ability;
+import mage.abilities.condition.Condition;
+import mage.abilities.keyword.BeholdDragonAbility;
+import mage.game.Game;
+import mage.util.CardUtil;
+
+/**
+ * Checks if the spell was cast with the alternate behold a Dragon cost
+ *
+ * @author TheElk801
+ */
+public enum BeheldDragonCondition implements Condition {
+    instance;
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        return CardUtil.checkSourceCostsTagExists(game, source, BeholdDragonAbility.BEHOLD_DRAGON_ACTIVATION_VALUE_KEY);
+    }
+
+    @Override
+    public String toString() {
+        return "Dragon was beheld";
+    }
+}

Mage/src/main/java/mage/abilities/keyword/BeholdDragonAbility.java

@@ -0,0 +1,91 @@
+package mage.abilities.keyword;
+
+import mage.abilities.Ability;
+import mage.abilities.SpellAbility;
+import mage.abilities.StaticAbility;
+import mage.abilities.costs.*;
+import mage.abilities.costs.common.BeholdDragonCost;
+import mage.abilities.costs.common.CollectEvidenceCost;
+import mage.abilities.hint.common.EvidenceHint;
+import mage.constants.Outcome;
+import mage.constants.Zone;
+import mage.game.Game;
+import mage.players.Player;
+
+/**
+ * @author TheElk801
+ */
+public class BeholdDragonAbility extends StaticAbility implements OptionalAdditionalSourceCosts {
+
+    private static final String promptString = "Behold a Dragon";
+    private static final String keywordText = "As an additional cost to cast this spell, you may behold a Dragon";
+    private static final String reminderText = "Choose a Dragon you control or reveal a Dragon card from your hand.";
+    private final String rule;
+
+    public static final String BEHOLD_DRAGON_ACTIVATION_VALUE_KEY = "beholdDragonActivation";
+
+    protected OptionalAdditionalCost additionalCost;
+
+    public static OptionalAdditionalCost makeCost() {
+        OptionalAdditionalCost cost = new OptionalAdditionalCostImpl(keywordText , reminderText, new BeholdDragonCost());
+        cost.setRepeatable(false);
+        return cost;
+    }
+    public BeholdDragonAbility( ) {
+        super(Zone.STACK, null);
+        this.additionalCost = makeCost();
+        this.rule = additionalCost.getName() + ". "  + additionalCost.getReminderText();
+        this.setRuleAtTheTop(true);
+    }
+
+    private BeholdDragonAbility(final BeholdDragonAbility ability) {
+        super(ability);
+        this.rule = ability.rule;
+        this.additionalCost = ability.additionalCost.copy();
+    }
+
+    @Override
+    public BeholdDragonAbility copy() {
+        return new BeholdDragonAbility(this);
+    }
+
+    public void resetCost() {
+        if (additionalCost != null) {
+            additionalCost.reset();
+        }
+    }
+
+    @Override
+    public void addOptionalAdditionalCosts(Ability ability, Game game) {
+        if (!(ability instanceof SpellAbility)) {
+            return;
+        }
+
+        Player player = game.getPlayer(ability.getControllerId());
+        if (player == null) {
+            return;
+        }
+
+        this.resetCost();
+        boolean canPay = additionalCost.canPay(ability, this, ability.getControllerId(), game);
+        if (!canPay || !player.chooseUse(Outcome.Exile, promptString +  '?', ability, game)) {
+            return;
+        }
+
+        additionalCost.activate();
+        for (Cost cost : ((Costs<Cost>) additionalCost)) {
+            ability.getCosts().add(cost.copy());
+        }
+        ability.setCostsTag(BEHOLD_DRAGON_ACTIVATION_VALUE_KEY, null);
+    }
+
+    @Override
+    public String getCastMessageSuffix() {
+        return additionalCost.getCastSuffixMessage(0);
+    }
+
+    @Override
+    public String getRule() {
+        return rule;
+    }
+}