implement [MH3] Invert Polarity

Mage.Sets/src/mage/cards/i/InvertPolarity.java

@@ -0,0 +1,102 @@
+package mage.cards.i;
+
+import mage.abilities.Ability;
+import mage.abilities.effects.OneShotEffect;
+import mage.abilities.effects.common.CounterTargetEffect;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.constants.Outcome;
+import mage.game.Game;
+import mage.game.stack.Spell;
+import mage.players.Player;
+import mage.target.TargetSpell;
+
+import java.util.UUID;
+
+/**
+ * @author Susucr
+ */
+public final class InvertPolarity extends CardImpl {
+
+    public InvertPolarity(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.INSTANT}, "{U}{U}{R}");
+
+        // Choose target spell, then flip a coin. If you win the flip, gain control of that spell and you may choose new targets for it. If you lose the flip, counter that spell.
+        this.getSpellAbility().addTarget(new TargetSpell());
+        this.getSpellAbility().addEffect(new InvertPolarityTargetEffect());
+    }
+
+    private InvertPolarity(final InvertPolarity card) {
+        super(card);
+    }
+
+    @Override
+    public InvertPolarity copy() {
+        return new InvertPolarity(this);
+    }
+}
+
+class InvertPolarityTargetEffect extends OneShotEffect {
+
+    InvertPolarityTargetEffect() {
+        super(Outcome.Detriment);
+        staticText = "choose target spell, then flip a coin. If you win the flip, gain control of that spell "
+                + "and you may choose new targets for it. If you lose the flip, counter that spell";
+    }
+
+    private InvertPolarityTargetEffect(final InvertPolarityTargetEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public InvertPolarityTargetEffect copy() {
+        return new InvertPolarityTargetEffect(this);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        Player player = game.getPlayer(source.getControllerId());
+        if (player == null) {
+            return false;
+        }
+        if (player.flipCoin(source, game, true)) {
+            new InvertPolarityGainControlTargetEffect()
+                    .setTargetPointer(getTargetPointer().copy())
+                    .apply(game, source);
+        } else {
+            new CounterTargetEffect()
+                    .setTargetPointer(getTargetPointer().copy())
+                    .apply(game, source);
+        }
+        return true;
+    }
+}
+
+class InvertPolarityGainControlTargetEffect extends OneShotEffect {
+
+    InvertPolarityGainControlTargetEffect() {
+        super(Outcome.GainControl);
+    }
+
+    private InvertPolarityGainControlTargetEffect(final InvertPolarityGainControlTargetEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public InvertPolarityGainControlTargetEffect copy() {
+        return new InvertPolarityGainControlTargetEffect(this);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        Player controller = game.getPlayer(source.getControllerId());
+        Spell spell = game.getStack().getSpell(this.getTargetPointer().getFirst(game, source));
+        if (controller != null && spell != null) {
+            spell.setControllerId(controller.getId());
+            spell.chooseNewTargets(game, controller.getId(), false, false, null);
+            return true;
+        }
+        return false;
+    }
+}

Mage.Sets/src/mage/sets/ModernHorizons3.java

@@ -147,6 +147,7 @@ public final class ModernHorizons3 extends ExpansionSet {
         cards.add(new SetCardInfo("Infernal Captor", 125, Rarity.COMMON, mage.cards.i.InfernalCaptor.class));
         cards.add(new SetCardInfo("Inspired Inventor", 32, Rarity.COMMON, mage.cards.i.InspiredInventor.class));
         cards.add(new SetCardInfo("Inventor's Axe", 126, Rarity.COMMON, mage.cards.i.InventorsAxe.class));
+        cards.add(new SetCardInfo("Invert Polarity", 190, Rarity.RARE, mage.cards.i.InvertPolarity.class));
         cards.add(new SetCardInfo("Island", 305, Rarity.LAND, mage.cards.basiclands.Island.class, FULL_ART_BFZ_VARIOUS));
         cards.add(new SetCardInfo("It That Heralds the End", 9, Rarity.UNCOMMON, mage.cards.i.ItThatHeraldsTheEnd.class));
         cards.add(new SetCardInfo("Izzet Generatorium", 191, Rarity.UNCOMMON, mage.cards.i.IzzetGeneratorium.class));