Shredder, Shadow Master creates copies of himself like in the arcade games final boss fight
These include Gold Stars (Gen 3), Primes (HGSS Era), Prism Stars (Gen 7), Radiants (Gen 8), and now the return of a generation 5 gimmick - Ace Specs which have been given their own rarity
One of the best phasing cards in the game, March of Swirling Mist is just so flexible, saving your own creatures or phasing out your opponents completely at your discretion
Spellmorph is a theoretical mechanic that was shown off in the Mystery Booster playtest cards
Remove all damage counters from Kadabra
However, its not quite as strong as another Beast card thats seeing a ton of play in the Lorcana meta: Beast Tragic Hero