Implemented Yorion, Sky Nomad (#6407)

* Implemented Yorion, Sky Nomad

* Implemented Yorion, Sky Nomad (but for real this time)

* updated game creation to use the correct deck size for limited

Mage/src/main/java/mage/abilities/keyword/CompanionCondition.java

@@ -17,7 +17,8 @@ public interface CompanionCondition extends Serializable {
 
     /**
      * @param deck The set of cards to check.
+     * @param startingSize
      * @return Whether the companion is valid for that deck.
      */
-    boolean isLegal(Set<Card> deck);
+    boolean isLegal(Set<Card> deck, int startingSize);
 }