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For it to be active you need to have one of the three legendary one drop dorks in the list, which we will assume you can cast

Reward: 12x Shop Ticket

Its ETB trigger to proliferate twice is good, but the 7 mana required makes casting a 3/3 with no combat abilities a really tough sell

Additionally, it has both vigilance and menace, and it makes the owner draw a card and then discard a card whenever they attack, but more importantly, it reads "Whenever you draw a card, Zombies you control get +1/+1 until end of turn." This MTG card combos exceptionally well with Graveborn Muse, as it can grant players the ability to draw a lot of cards each turn, then making Zombies get +1/+1 for each of those cards via Temmet