[STX] Implemented Exponential Growth

Mage.Sets/src/mage/cards/e/ExponentialGrowth.java

@@ -0,0 +1,74 @@
+package mage.cards.e;
+
+import mage.abilities.Ability;
+import mage.abilities.effects.OneShotEffect;
+import mage.abilities.effects.common.continuous.BoostTargetEffect;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.constants.Duration;
+import mage.constants.Outcome;
+import mage.game.Game;
+import mage.game.permanent.Permanent;
+import mage.target.common.TargetCreaturePermanent;
+import mage.util.CardUtil;
+
+import java.util.UUID;
+
+/**
+ * @author TheElk801
+ */
+public final class ExponentialGrowth extends CardImpl {
+
+    public ExponentialGrowth(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.SORCERY}, "{X}{G}{G}");
+
+        // Until end of turn, double target creature's power X times.
+        this.getSpellAbility().addEffect(new ExponentialGrowthEffect());
+        this.getSpellAbility().addTarget(new TargetCreaturePermanent());
+    }
+
+    private ExponentialGrowth(final ExponentialGrowth card) {
+        super(card);
+    }
+
+    @Override
+    public ExponentialGrowth copy() {
+        return new ExponentialGrowth(this);
+    }
+}
+
+class ExponentialGrowthEffect extends OneShotEffect {
+
+    ExponentialGrowthEffect() {
+        super(Outcome.Benefit);
+        staticText = "until end of turn, double target creature's power X times";
+    }
+
+    private ExponentialGrowthEffect(final ExponentialGrowthEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public ExponentialGrowthEffect copy() {
+        return new ExponentialGrowthEffect(this);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        Permanent permanent = game.getPermanent(source.getFirstTarget());
+        if (permanent == null) {
+            return false;
+        }
+        int xValue = source.getManaCostsToPay().getX();
+        int multiplier = 1;
+        for (int i = 0; i < xValue; i++) {
+            multiplier = CardUtil.overflowMultiply(multiplier, 2);
+        }
+        multiplier = CardUtil.overflowDec(multiplier, 1);
+        game.addEffect(new BoostTargetEffect(CardUtil.overflowMultiply(
+                multiplier, permanent.getPower().getValue()
+        ), 0, Duration.EndOfTurn), source);
+        return true;
+    }
+}

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

@@ -62,6 +62,7 @@ public final class StrixhavenSchoolOfMages extends ExpansionSet {
         cards.add(new SetCardInfo("Eureka Moment", 184, Rarity.COMMON, mage.cards.e.EurekaMoment.class));
         cards.add(new SetCardInfo("Expanded Anatomy", 2, Rarity.COMMON, mage.cards.e.ExpandedAnatomy.class));
         cards.add(new SetCardInfo("Expel", 18, Rarity.COMMON, mage.cards.e.Expel.class));
+        cards.add(new SetCardInfo("Exponential Growth", 130, Rarity.RARE, mage.cards.e.ExponentialGrowth.class));
         cards.add(new SetCardInfo("Field Trip", 131, Rarity.COMMON, mage.cards.f.FieldTrip.class));
         cards.add(new SetCardInfo("Forest", 374, Rarity.LAND, mage.cards.basiclands.Forest.class, NON_FULL_USE_VARIOUS));
         cards.add(new SetCardInfo("Fortifying Draught", 132, Rarity.UNCOMMON, mage.cards.f.FortifyingDraught.class));