* Added new game mode: Oathbreaker (#5678);

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

@@ -0,0 +1,61 @@
+package mage.abilities.common;
+
+import mage.abilities.Ability;
+import mage.abilities.condition.Condition;
+import mage.abilities.effects.ContinuousRuleModifyingEffectImpl;
+import mage.constants.Duration;
+import mage.constants.Outcome;
+import mage.game.Game;
+import mage.game.events.GameEvent;
+
+import java.util.UUID;
+
+/**
+ * For oathbreaker game mode
+ *
+ * @author JayDi85
+ */
+public class SignatureSpellCastOnlyWithOathbreakerEffect extends ContinuousRuleModifyingEffectImpl {
+
+    private final Condition condition;
+    private final UUID signatureSpell;
+
+    public SignatureSpellCastOnlyWithOathbreakerEffect(Condition condition, UUID signatureSpell) {
+        super(Duration.EndOfGame, Outcome.Detriment);
+        this.condition = condition;
+        this.signatureSpell = signatureSpell;
+        staticText = setText();
+    }
+
+    private SignatureSpellCastOnlyWithOathbreakerEffect(final SignatureSpellCastOnlyWithOathbreakerEffect effect) {
+        super(effect);
+        this.condition = effect.condition;
+        this.signatureSpell = effect.signatureSpell;
+    }
+
+    @Override
+    public boolean checksEventType(GameEvent event, Game game) {
+        return event.getType() == GameEvent.EventType.CAST_SPELL;
+    }
+
+    @Override
+    public boolean applies(GameEvent event, Ability source, Game game) {
+        if (event.getSourceId().equals(signatureSpell)) {
+            return condition != null && !condition.apply(game, source);
+        }
+        return false; // cast not prevented by this effect
+    }
+
+    @Override
+    public SignatureSpellCastOnlyWithOathbreakerEffect copy() {
+        return new SignatureSpellCastOnlyWithOathbreakerEffect(this);
+    }
+
+    private String setText() {
+        StringBuilder sb = new StringBuilder("cast this spell only ");
+        if (condition != null) {
+            sb.append(' ').append(condition.toString());
+        }
+        return sb.toString();
+    }
+}