Crypt Champion

A black mana cost that secretly demands a second color to deliver on its promise. Cast it for its printed cost and you get a reanimation symmetric to the point of self-sabotage: each player returns one small creature from their graveyard, yours and theirs both rising at once, and then the Zombie sacrifices itself the moment its own trigger resolves. Spend a red somewhere in that cost and the body survives, a 2/2 double striker stapled to a one-shot graveyard revival. The isn't an upgrade so much as a permission slip, the line between a board-filling effect that immediately dies and a permanent threat that also restocks the field. The design is a black-red card wearing a mono-black face: the second color is paid as a tax rather than printed into the casting requirement, so the card scans as monocolor but only pays off when you splash. The symmetry is the wrinkle worth respecting. Reviving a creature for every player makes it a worse self-mill payoff than it looks and a better tempo equalizer than it reads, since the moment to cast it is the turn your graveyard is stocked and your opponent's is bare. Everything it actually does happens in the sequencing of its two enter triggers (which you order) and whether the survival clause finds a red mana to point at.