Out of the five cards released this way, one turned out to be a Vintage staple, Mana Crypt, with art from Mark Tedin

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Ive got a few ideas that might help you figure that out
Whether by casting huge Eldrazi or looping many spells, Omniscience is known to end games
Muldrotha is a popular Commander to run with cards like Mindslaver, Lotus Petal, and Displacer Kitten, allowing players to farm a spell of their choosing