1999 metal pokemon cards SEALED never opened Mewtwo GOLD BurgerKing CARD · Whatnot: Shop, Sell, Connect who remembers the 1999 Burger

This means that once a creature becomes monstrous, it cant become monstrous again, making the monstrosity ability a one-time use per creature

10 Mega XY Evolutions EX Full Art ($30) The XY - Evolutions EX full art card of Mega Blastoise may just be $30, but it happens to feature arguably the best card art on this entire list

Its fantastically simple to set up infinite loops with cards like Banishing Knack or Retraction Helix to infinitely bounce 0-cost artifacts alongside Mirran Spy or other creatures that untap themselves when you cast an artifact

Couple this with the more generic options like Metallic Mimic and Adaptive Automaton and you could easily fill a deck with tons of these cards

Resolve the original spell with the Cascade keyword

Theyre usually inexpensive complete decks that can be played directly out of the box and are sometimes Standard-legal at the time of their release