AI: improved stability and bug fixes (related to #13290):

- bug's reason: wrong usage of canTarget, add/addTarget, getOpponents, etc;
- fixed that it can target dead players in some use cases (close #13507);
- fixed that it wrongly choose targets in bad/good effects in some use cases;
- fixed that it can't find valid targets in some use cases;
- fixed game freezes and errors with some cards;

Mage/src/main/java/mage/abilities/effects/common/combat/AttackIfAbleTargetRandomOpponentSourceEffect.java

@@ -36,7 +36,7 @@ public class AttackIfAbleTargetRandomOpponentSourceEffect extends OneShotEffect
         if (controller == null) {
             return false;
         }
-        List<UUID> opponents = new ArrayList<>(game.getOpponents(controller.getId()));
+        List<UUID> opponents = new ArrayList<>(game.getOpponents(controller.getId(), true));
         Player opponent = game.getPlayer(opponents.get(RandomUtil.nextInt(opponents.size())));
         if (opponent != null) {
             game.informPlayers(opponent.getLogName() + " was chosen at random.");

Mage/src/main/java/mage/target/Target.java

@@ -55,6 +55,9 @@ public interface Target extends Serializable {
 
     boolean chooseTarget(Outcome outcome, UUID playerId, Ability source, Game game);
 
+    /**
+     * Add target from targeting methods like chooseTarget (will check and generate target events and effects)
+     */
     void addTarget(UUID id, Ability source, Game game);
 
     void addTarget(UUID id, int amount, Ability source, Game game);
@@ -90,6 +93,9 @@ public interface Target extends Serializable {
 
     boolean choose(Outcome outcome, UUID playerId, UUID sourceId, Ability source, Game game);
 
+    /**
+     * Add target from non targeting methods like choose
+     */
     void add(UUID id, Game game);
 
     void remove(UUID targetId);