Thraben Foulbloods

Black gets a plain three-mana body here, and the delirium clause is the entire transaction: four card types in the graveyard before it pays out. That threshold is the friction the design leans on. A deck running mostly creatures and removal will not clear it by accident, so reaching four types means banking instants, sorceries, artifacts, lands, or enchantments alongside the bodies. The creature contributes nothing to that count on its own; it is strictly a payoff, waiting on a graveyard already stocked by cheap spells, self-discard, or mill. Once delirium comes online, the +1/+1 is the lesser half of the reward. Menace is the operative piece. A 3/2 trades one-for-one against a lone blocker; the delirium-sized version forces the opponent to commit two bodies to stop one attacker, which is exactly the math an aggressive black deck wants when the board has gummed up and damage needs to push through. The card asks for its price up front: undelivered, it is a middling attacker and little else, and the conditional only flips when the graveyard reflects a deck built to feed it. It belongs to a line of common-rarity delirium payoffs meant to give graveyard-matters strategies a reason to run aggressive creatures, rewarding the deck already doing the mechanic's work rather than handing the bonus over for free.