Conditional target adjuster (#12585)

* Add ReplacingTargetAdjuster

* Use new target adjuster

* Change name to ConditionalTargetAdjuster, don't use blueprint

* Take a Targets list

* Add keepOldTargets option

* Add missed DamagedPlayerControlsTargetAdjuster to Sigil of Sleep

* Cards using updated ConditionalTargetAdjuster

* BLB gift cards currently implemented

* fix wrong default for keepOldTargets

* Fix Urborg Repossession missing 1st target tag

Mage/src/main/java/mage/target/targetadjustment/ConditionalTargetAdjuster.java

@@ -0,0 +1,62 @@
+package mage.target.targetadjustment;
+
+import mage.abilities.Ability;
+import mage.abilities.condition.Condition;
+import mage.game.Game;
+import mage.target.Target;
+import mage.target.Targets;
+
+/**
+ * @author notgreat
+ */
+public class ConditionalTargetAdjuster implements TargetAdjuster {
+    private final Condition condition;
+    private final boolean keepOldTargets;
+    private final Targets replacementTargets;
+
+    /**
+     * If the condition is true, replace the target
+     *
+     * @param condition         The condition to be checked
+     * @param replacementTarget The target to use if the condition is true.
+     */
+    public ConditionalTargetAdjuster(Condition condition, Target replacementTarget) {
+        this(condition, false, new Targets(replacementTarget));
+    }
+
+    /**
+     * If the condition is true, change the target list
+     *
+     * @param condition         The condition to be checked
+     * @param keepOldTargets    Add to the targets list instead of replacing it entirely
+     * @param replacementTarget The target to use if the condition is true. Can also take a Targets list
+     */
+    public ConditionalTargetAdjuster(Condition condition, boolean keepOldTargets, Target replacementTarget) {
+        this(condition, keepOldTargets, new Targets(replacementTarget));
+    }
+
+    /**
+     * If the condition is true, change the target list with multiple targets at once
+     *
+     * @param condition          The condition to be checked
+     * @param keepOldTargets     Add to the targets list instead of replacing it entirely
+     * @param replacementTargets The targets list to use if the condition is true.
+     */
+    public ConditionalTargetAdjuster(Condition condition, boolean keepOldTargets, Targets replacementTargets) {
+        this.condition = condition;
+        this.keepOldTargets = keepOldTargets;
+        this.replacementTargets = replacementTargets;
+    }
+
+    @Override
+    public void adjustTargets(Ability ability, Game game) {
+        if (condition.apply(game, ability)) {
+            if (!keepOldTargets) {
+                ability.getTargets().clear();
+            }
+            for (Target target : replacementTargets) {
+                ability.addTarget(target.copy());
+            }
+        }
+    }
+}