a rainbow pokemon card Legendary Cards Credit Bundle Skin put 1 damage counter on that Pokémon Rainbow Energy (Secret) - Holofoil

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(You can't use more than 1 GX attack in a game.) Card rule When your Pokmon-GX is Knocked Out, your opponent takes 2 Prize cards.

from Lorcanas First Chapter

5 Duskmourn: House Of Horror Commander Deck - Death Toll $27.14 Grave Opportunities This Duskmourn: House of Horror Commander Deck will leave your foes shaking in fear of your dominating board that just won't stay in the graveyard no matter how hard they try

Theres also the legal and platform angle

Once this deck started drawing extra cards, its ability to deploy spells was so much better than anything else in the format that there was no keeping up with it