[PIP] Implement Shaun, Father of Synths (#12109)

* Added method to set triggered abilities to optional

* TokenCopy effect now copies permanentModifier

* Implemented Shaun, Father of Synths

* remove TODO

* Made `setOptional` chainable

Mage/src/main/java/mage/abilities/TriggeredAbilityImpl.java

@@ -363,6 +363,21 @@ public abstract class TriggeredAbilityImpl extends AbilityImpl implements Trigge
         return optional;
     }
 
+    @Override
+    public TriggeredAbility setOptional() {
+        this.optional = true;
+
+        if (getEffects().stream().filter(
+                effect -> effect instanceof DoIfCostPaid && (this.optional && ((DoIfCostPaid) effect).isOptional()))
+                .findAny().isPresent()) {
+            throw new IllegalArgumentException(
+                    "DoIfCostPaid effect must have only one optional settings, but it have two (trigger + DoIfCostPaid): "
+                            + this.getClass().getSimpleName());
+        }
+
+        return this;
+    }
+
     @Override
     public TriggeredAbilityImpl setAbilityWord(AbilityWord abilityWord) {
         super.setAbilityWord(abilityWord);