Implemented Netherborn Altar

Mage.Sets/src/mage/cards/n/NetherbornAltar.java

@@ -0,0 +1,96 @@
+package mage.cards.n;
+
+import mage.abilities.Ability;
+import mage.abilities.common.SimpleActivatedAbility;
+import mage.abilities.costs.common.PutCountersSourceCost;
+import mage.abilities.costs.common.TapSourceCost;
+import mage.abilities.effects.OneShotEffect;
+import mage.cards.Card;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.constants.CommanderCardType;
+import mage.constants.Outcome;
+import mage.constants.Zone;
+import mage.counters.CounterType;
+import mage.game.Game;
+import mage.game.permanent.Permanent;
+import mage.players.Player;
+
+import java.util.List;
+import java.util.Objects;
+import java.util.UUID;
+import java.util.stream.Collectors;
+
+/**
+ * @author TheElk801
+ */
+public final class NetherbornAltar extends CardImpl {
+
+    public NetherbornAltar(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.ARTIFACT}, "{1}{B}");
+
+        // {T}, Put a soul counter on Netherborn Altar: Put your commander into your hand from the command zone. Then you lose 3 life for each soul counter on Netherborn Altar.
+        Ability ability = new SimpleActivatedAbility(new NetherbornAltarEffect(), new TapSourceCost());
+        ability.addCost(new PutCountersSourceCost(CounterType.SOUL.createInstance()));
+        this.addAbility(ability);
+    }
+
+    private NetherbornAltar(final NetherbornAltar card) {
+        super(card);
+    }
+
+    @Override
+    public NetherbornAltar copy() {
+        return new NetherbornAltar(this);
+    }
+}
+
+class NetherbornAltarEffect extends OneShotEffect {
+
+    NetherbornAltarEffect() {
+        super(Outcome.Benefit);
+        staticText = "Put your commander into your hand from the command zone. Then you lose 3 life for each soul counter on {this}.";
+    }
+
+    private NetherbornAltarEffect(final NetherbornAltarEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public NetherbornAltarEffect copy() {
+        return new NetherbornAltarEffect(this);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        Player controller = game.getPlayer(source.getControllerId());
+        if (controller == null) {
+            return false;
+        }
+        List<Card> commandersInCommandZone = game
+                .getCommandersIds(controller, CommanderCardType.COMMANDER_OR_OATHBREAKER)
+                .stream()
+                .map(game::getCard)
+                .filter(Objects::nonNull)
+                .filter(commander -> game.getState().getZone(commander.getId()) == Zone.COMMAND)
+                .collect(Collectors.toList());
+        if (commandersInCommandZone.size() == 1) {
+            controller.moveCards(commandersInCommandZone.get(0), Zone.HAND, source, game);
+        } else if (commandersInCommandZone.size() == 2) {
+            Card firstCommander = commandersInCommandZone.get(0);
+            Card secondCommander = commandersInCommandZone.get(1);
+            if (controller.chooseUse(Outcome.ReturnToHand, "Return which commander to hand?", null, firstCommander.getName(), secondCommander.getName(), source, game)) {
+                controller.moveCards(firstCommander, Zone.HAND, source, game);
+            } else {
+                controller.moveCards(secondCommander, Zone.HAND, source, game);
+            }
+        }
+        Permanent permanent = game.getPermanentOrLKIBattlefield(source.getSourceId());
+        if (permanent == null) {
+            int counterCount = permanent.getCounters(game).getCount(CounterType.SOUL);
+            controller.loseLife(3 * counterCount, game, false);
+        }
+        return true;
+    }
+}

Mage.Sets/src/mage/sets/Commander2020Edition.java

@@ -25,6 +25,7 @@ public final class Commander2020Edition extends ExpansionSet {
         cards.add(new SetCardInfo("Crop Rotation", 169, Rarity.COMMON, mage.cards.c.CropRotation.class));
         cards.add(new SetCardInfo("Curious Herd", 59, Rarity.RARE, mage.cards.c.CuriousHerd.class));
         cards.add(new SetCardInfo("Lifecrafter's Bestiary", 244, Rarity.RARE, mage.cards.l.LifecraftersBestiary.class));
+        cards.add(new SetCardInfo("Netherborn Altar", 45, Rarity.RARE, mage.cards.n.NetherbornAltar.class));
         cards.add(new SetCardInfo("Rashmi, Eternities Crafter", 229, Rarity.RARE, mage.cards.r.RashmiEternitiesCrafter.class));
         cards.add(new SetCardInfo("Shared Animosity", 158, Rarity.RARE, mage.cards.s.SharedAnimosity.class));
     }

Mage/src/main/java/mage/counters/CounterType.java

@@ -127,6 +127,7 @@ public enum CounterType {
     SLIME("slime"),
     SLUMBER("slumber"),
     SOOT("soot"),
+    SOUL("soul"),
     SPITE("spite"),
     SPORE("spore"),
     STORAGE("storage"),