Netherborn Phalanx

Most six-mana black cards in a deck are there to win games; this one is there to find them. The 2/4 Horror body exists chiefly to give the spell a creature type and a price tag, because the part that earns its slot is the discard-and-search ability, which fetches any other card in your library that also costs six. That makes it a backup copy of whatever six-drop your deck is built around: a tutor wearing a creature's clothes, mediocre when cast for value and decisive when discarded before it ever resolves. The enters trigger is the consolation prize for casting it straight, draining each opponent for the creatures they control, which scales cleanly against the go-wide boards that a slow black control shell tends to dread. But the design logic lives in the duality. Cast it for reach when you have nothing better; or pitch it sorcery-speed to reshape your hand toward the real plan. The keyword always asked you to weigh a card's face against its function as a search engine, and few cards make that tension as legible as this one, where the body and the tutor pull in opposite directions. Note that the search cost is heavier in colored pips than the you pay to cast the thing: that double-black is the commitment, and the tempo, you spend to convert a forgettable body into exactly the six-drop the situation demands.