From c307d6ee3d347e400c8f9d379ab10c2b2a78ae8d Mon Sep 17 00:00:00 2001
From: Evan Kranzler <theelk801@gmail.com>
Date: Tue, 6 Apr 2021 20:54:28 -0400
Subject: [PATCH] [STX] Implemented Mercurial Transformation

---
 .../mage/cards/m/MercurialTransformation.java | 83 +++++++++++++++++++
 .../mage/sets/StrixhavenSchoolOfMages.java    |  1 +
 2 files changed, 84 insertions(+)
 create mode 100644 Mage.Sets/src/mage/cards/m/MercurialTransformation.java

diff --git a/Mage.Sets/src/mage/cards/m/MercurialTransformation.java b/Mage.Sets/src/mage/cards/m/MercurialTransformation.java
new file mode 100644
index 00000000000..569fc45200d
--- /dev/null
+++ b/Mage.Sets/src/mage/cards/m/MercurialTransformation.java
@@ -0,0 +1,83 @@
+package mage.cards.m;
+
+import mage.abilities.Ability;
+import mage.abilities.effects.OneShotEffect;
+import mage.abilities.effects.common.continuous.BecomesCreatureTargetEffect;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.constants.Duration;
+import mage.constants.Outcome;
+import mage.constants.SubType;
+import mage.game.Game;
+import mage.game.permanent.token.Token;
+import mage.game.permanent.token.custom.CreatureToken;
+import mage.players.Player;
+import mage.target.common.TargetNonlandPermanent;
+
+import java.util.UUID;
+
+/**
+ * @author TheElk801
+ */
+public final class MercurialTransformation extends CardImpl {
+
+    public MercurialTransformation(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.SORCERY}, "{1}{U}");
+
+        this.subtype.add(SubType.LESSON);
+
+        // Until end of turn, target nonland permanent loses all abilities and becomes your choice of a blue Frog creature with base power and toughness 1/1 or a blue Octopus creature with base power and toughness 4/4.
+        this.getSpellAbility().addEffect(new MercurialTransformationEffect());
+        this.getSpellAbility().addTarget(new TargetNonlandPermanent());
+    }
+
+    private MercurialTransformation(final MercurialTransformation card) {
+        super(card);
+    }
+
+    @Override
+    public MercurialTransformation copy() {
+        return new MercurialTransformation(this);
+    }
+}
+
+class MercurialTransformationEffect extends OneShotEffect {
+
+    MercurialTransformationEffect() {
+        super(Outcome.Benefit);
+        staticText = "until end of turn, target nonland permanent loses all abilities and " +
+                "becomes your choice of a blue Frog creature with base power and toughness 1/1 " +
+                "or a blue Octopus creature with base power and toughness 4/4";
+    }
+
+    private MercurialTransformationEffect(final MercurialTransformationEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public MercurialTransformationEffect copy() {
+        return new MercurialTransformationEffect(this);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        Player player = game.getPlayer(source.getControllerId());
+        if (player == null) {
+            return false;
+        }
+        Token token;
+        if (player.chooseUse(
+                outcome, "1/1 Frog or 4/4 Octopus?",
+                null, "Frog", "Octopus", source, game
+        )) {
+            token = new CreatureToken(1, 1).withColor("U").withSubType(SubType.FROG);
+        } else {
+            token = new CreatureToken(4, 4).withColor("U").withSubType(SubType.OCTOPUS);
+        }
+        game.addEffect(new BecomesCreatureTargetEffect(
+                token, true, false, Duration.EndOfTurn
+        ), source);
+        return true;
+    }
+}
diff --git a/Mage.Sets/src/mage/sets/StrixhavenSchoolOfMages.java b/Mage.Sets/src/mage/sets/StrixhavenSchoolOfMages.java
index a9df4c8ae79..1c76826352a 100644
--- a/Mage.Sets/src/mage/sets/StrixhavenSchoolOfMages.java
+++ b/Mage.Sets/src/mage/sets/StrixhavenSchoolOfMages.java
@@ -148,6 +148,7 @@ public final class StrixhavenSchoolOfMages extends ExpansionSet {
         cards.add(new SetCardInfo("Mascot Interception", 110, Rarity.UNCOMMON, mage.cards.m.MascotInterception.class));
         cards.add(new SetCardInfo("Master Symmetrist", 138, Rarity.UNCOMMON, mage.cards.m.MasterSymmetrist.class));
         cards.add(new SetCardInfo("Mentor's Guidance", 46, Rarity.UNCOMMON, mage.cards.m.MentorsGuidance.class));
+        cards.add(new SetCardInfo("Mercurial Transformation", 47, Rarity.UNCOMMON, mage.cards.m.MercurialTransformation.class));
         cards.add(new SetCardInfo("Moldering Karok", 206, Rarity.COMMON, mage.cards.m.MolderingKarok.class));
         cards.add(new SetCardInfo("Mortality Spear", 207, Rarity.UNCOMMON, mage.cards.m.MortalitySpear.class));
         cards.add(new SetCardInfo("Mountain", 372, Rarity.LAND, mage.cards.basiclands.Mountain.class, NON_FULL_USE_VARIOUS));