black mewtwo pokemon card GX Dark Nova Pokémon Gold-Brand, Rare Add strength and power to your game with this Pokemon Mewtwo Collection Shadow Metwo V Pokemon Card

Professor's Research (Regulation Mark: G) is not legal in Standard format

21, the set follows the story of Avatar Aang and his friends across the three-season run of Avatar: The Last Airbender. The wide-ranging product release will include play boosters, collector boosters, a bundle, a commanders bundle, Jumpstart boosters, prerelease packs, a beginner box and scene boxes

I've found some pretty cool stuff that isn't even Magic -related this way as well

Obviously no one is paying full price for Krang, but if you can cheat him in or resurrect him from the graveyard this is an Avacyn upgrade that doesn't need you to be in white