added M21 set file

Mage.Sets/src/mage/sets/CoreSet2021.java

@@ -0,0 +1,36 @@
+package mage.sets;
+
+import mage.cards.ExpansionSet;
+import mage.cards.repository.CardInfo;
+import mage.constants.Rarity;
+import mage.constants.SetType;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * @author TheElk801
+ */
+public final class CoreSet2021 extends ExpansionSet {
+
+    private static final CoreSet2021 instance = new CoreSet2021();
+
+    public static CoreSet2021 getInstance() {
+        return instance;
+    }
+
+    private final List<CardInfo> savedSpecialLand = new ArrayList<>();
+
+    private CoreSet2021() {
+        super("Core Set 2021", "M21", ExpansionSet.buildDate(2020, 7, 3), SetType.CORE);
+        this.hasBoosters = true;
+        this.hasBasicLands = false; // change when basics are available
+        this.numBoosterSpecial = 0;
+        this.numBoosterLands = 1;
+        this.numBoosterCommon = 10;
+        this.numBoosterUncommon = 3;
+        this.numBoosterRare = 1;
+        this.ratioBoosterMythic = 8;
+        this.maxCardNumberInBooster = 274;
+    }
+}

Utils/known-sets.txt

@@ -35,6 +35,7 @@ Conflux|Conflux|
 Conspiracy: Take the Crown|ConspiracyTakeTheCrown|
 Core Set 2019|CoreSet2019|
 Core Set 2020|CoreSet2020|
+Core Set 2021|CoreSet2021|
 Dark Ascension|DarkAscension|
 Darksteel|Darksteel|
 Dissension|Dissension|

Utils/mtg-cards-data.txt

@@ -37438,3 +37438,5 @@ Gyruda, Doom of Depths|Ikoria: Lair of Behemoths|384|R|{4}{U/B}{U/B}|Legendary C
 Mysterious Egg|Ikoria: Lair of Behemoths|385|C|{1}|Creature - Egg|0|2|Whenever this creature mutates, put a +1/+1 counter on it.|
 Dirge Bat|Ikoria: Lair of Behemoths|386|R|{2}{B}{B}|Creature - Bat|3|3|Mutate {4}{B}{B}$Flash$Flying$Whenever this creature mutates, destroy target creature or planeswalker an opponent controls.|
 Crystalline Giant|Ikoria: Lair of Behemoths|387|R|{3}|Artifact Creature - Giant|3|3|At the beginning of combat on your turn, choose a kind of counter at random that Crystalline Giant doesn't have on it from among flying, first strike, deathtouch, hexproof, lifelink, menace, reach, trample, vigilance, or +1/+1. Put a counter of that kind on Crystalline Giant.|
+Mangara, the Diplomat|Core Set 2021|27|M|{3}{W}|Legendary Creature - Human Cleric|2|4|Lifelink$Whenever an opponent attacks with creatures, if two or more of those creatures are attacking you and/or a planeswalker you control, draw a card.$Whenever an opponent casts their second spell each turn, draw a card.|
+Double Vision|Core Set 2021|142|R|{3}{R}{R}|Enchantment|||Whenever you cast your first instant or sorcery spell each turn, copy that spell. You may choose new targets for the copy.|

Utils/mtg-sets-data.txt

@@ -131,6 +131,7 @@ Magic 2014|M14|
 Magic 2015|M15|
 Core Set 2019|M19|
 Core Set 2020|M20|
+Core Set 2021|M21|
 Masters 25|A25|
 Magic: The Gathering-Commander|CMD|
 Magic: The Gathering-Conspiracy|CNS|