Add Spectacle mechanic

src/magic/model/MagicAbility.java

@@ -675,6 +675,14 @@ public enum MagicAbility {
             card.add(ThisDiesTrigger.Afterlife(n));
         }
     },
+    Spectacle("spectacle( |—)" + ARG.COST, 10) {
+        @Override
+        protected void addAbilityImpl(final MagicAbilityStore card, final Matcher arg) {
+            final MagicCardDefinition cardDef = (MagicCardDefinition)card;
+            final List<MagicMatchedCostEvent> matchedCostEvents = MagicRegularCostEvent.buildCast(ARG.cost(arg));
+            card.add(new MagicSpectacleActivation(cardDef, matchedCostEvents));
+        }
+    },
 
     // abilities that involve SN
     ShockLand("As SN enters the battlefield, you may " + ARG.COST + "\\. If you don't, SN enters the battlefield tapped\\.", -10) {

src/magic/model/condition/MagicCondition.java

@@ -950,4 +950,12 @@ public abstract class MagicCondition implements MagicMatchedCostEvent {
             return player.controlsPermanent(MagicTargetFilterFactory.LEGENDARY_CREATURE_OR_PLANESWALKER);
         }
     };
+
+    public static MagicCondition SPECTACLE = new MagicCondition() {
+        @Override
+        public boolean accept(final MagicSource source) {
+            final MagicPlayer opponent = source.getOpponent();
+            return opponent.getLifeLossThisTurn() > 0;
+        }
+    };
 }

src/magic/model/event/MagicSpectacleActivation.java

@@ -0,0 +1,49 @@
+package magic.model.event;
+
+import java.util.Collections;
+
+import magic.model.MagicCard;
+import magic.model.MagicCardDefinition;
+import magic.model.MagicGame;
+import magic.model.MagicPayedCost;
+import magic.model.condition.MagicCondition;
+
+public class MagicSpectacleActivation extends MagicHandCastActivation {
+
+    private final List<MagicMatchedCostEvent> matchedCostEvents;
+
+    public MagicSpectacleActivation(final MagicCardDefinition cdef, final List<MagicMatchedCostEvent> aMatchedCostEvents) {
+        super(
+            new MagicCondition[]{
+                MagicCondition.CARD_CONDITION,
+                MagicCondition.SPECTACLE
+            },
+            cdef.getActivationHints(),
+            "Spectacle"
+        );
+        matchedCostEvents = aMatchedCostEvents;
+    }
+
+    @Override
+    public Iterable<? extends MagicEvent> getCostEvent(final MagicCard source) {
+        return MagicMatchedCostEvent.getCostEvent(matchedCostEvents, source);
+    }
+
+    @Override
+    public MagicEvent getEvent(final MagicCardOnStack cardOnStack,final MagicPayedCost payedCost) {
+        return new MagicEvent(
+            cardOnStack,
+            this,
+            "Put SN onto the battlefield, " +
+            "it gains haste and it's returned from the battlefield to its owner's hand at the beginning of the next end step."
+        );
+    }
+
+    @Override
+    public void executeEvent(final MagicGame game, final MagicEvent event) {
+        game.doAction(new PlayCardFromStackAction(
+            event.getCardOnStack(),
+            MagicPlayMod.HASTE, MagicPlayMod.RETURN_AT_END_OF_TURN
+        ));
+    }
+}