a mewtwo pokemon card AR 183/165 Pokemoncard151 Psychic Regeneration Heal 60 damage from this Pokémon Mewtwo EX (Full Art) 103

The Ur-Dragon When it comes to dragon payoffs, The Ur-Dragon is basically the gold standard

+1: Create a 3/2 red and green Spirit creature token

19 Brion Stoutarm A Good Pitching Arm Is Necessary A 4/4 with lifelink for four mana, Brion Stoutarm allows you to pay one mana and tap him in order to sacrifice a creature, dealing direct damage to an opponent of the user's choosing equal to that creature's power

Obviously, this isnt always the case, but when it comes to proxies and cards of that type, the general rule of thumb is that as long as youre upfront about them with your opponent and agree to work with them in your game, theyre fine

The rules on Battles were written in such a way as to enable any kind of spell being on the other side