pokemon card mewtwo and mew gx & Mew-GX SM91 Ultra Rare Retreat cost 2019 Pokemon Sm Black Star

Any effect that cares about these cards cast from exile also cares about cascade

Individual bending abilities like Waterbend, Earthbend, Firebend, and Airbend can work outside the set, sure but Avatar Aang himself becomes much harder to build around effectively, especially if your goal is flipping him consistently

Ghost Vacuum is a big upgrade on previous graveyard hate cards like Soul-Guide Lantern, partly because in certain circumstances you can turn it into a big play, but mostly because it's reusable

Having just said that, we are keen to develop a major artifact theme with this deck at it's base - we would want to consider both Tezzeret the Seeker and Tezzeret, Agent of Bolas in this mix along with similarily themed card choices

Creatures your opponents control can't block this turn