Some players denounce this card as a color pie break, but Welcoming Vampire would like to have a word about that
This still allows you to have two Commanders rather than one, and thanks to the tight theming of this deck, they work together extremely well
and Calculating Lich
It will also work well with commanders that let you return cards from your graveyard, like Muldrotha, the Gravetide, or commanders that let you profit from putting things into your graveyard, like Sidisi, Brood Tyrant
Your opponent will then be forced to decide between being poisoned by Poison Barbs reflect damage or letting Guzzlord trigger its Grindcore attack, potentially resulting in them being forced to discard multiple Energy from their own Pokemon
I ought to try out that Mewtwo, was having fun with the other that has Hypnosis instead (and the Phantom Mew did look pretty strong when I saw it on the Legendary Deck Machine)