Arnim Zola, Bio-Fanatic

The graveyard clause here is a threshold, not a fuel gauge: it checks that two or more creature cards are present and asks for nothing more, so a yard with ten dead creatures produces the same tapped 2/1 as one with exactly two. That binary switch marks its distance from the black tradition of graveyard-as-resource engines, where the yard is usually looped back into hand or exiled for value. The fuel is never spent, only counted, so the engine keeps humming as long as the count holds and shuts off the moment someone scours the graveyard below the line. Three mana and a tap for a 2/1 is a deliberately unhurried rate, and the tapped-with-menace clause explains the price: the token can't backpedal into a chump block, it arrives pointed at the next attack step. Menace does the quiet work of keeping a trickle of 2/1s relevant against a settled board, since each fresh clone can slip past a lone blocker every cycle. The result is an engine built for the crack-back rather than the stall, rewarding a board already committed to the offensive. The low threshold lets it come online early, but that same low bar makes graveyard hate a cleaner answer than removing the body: strip the yard past the checkpoint and the factory goes dark without anyone touching the 2/3 itself.