Minotaur Skullcleaver

Attack for four the turn it lands, then keep a body that no longer earns its keep: that is the whole transaction. The enter-the-battlefield boost lasts until end of turn, but it only ever cashes in during one combat step, which makes this reach disguised as a creature, built to convert the last few points of a life total into a corpse. Haste is what closes the arithmetic; without it the bonus would burn off before the creature could ever swing, leaving a plain 2/2 that missed its entire purpose. The comparison it invites is against a one-shot burn spell: burn spends itself and leaves your side of the board empty, while this deals its four through the red zone and leaves a 2/2 behind, a weaker follow-up than a fresh card but better than an empty hand. You pay for that lingering body in efficiency, since the +2/+0 will not come back next turn and the permanent 2/2 it settles into rarely decides the games this card was built to win. It is a closer for a fast deck, priced to end things before the leftover creature has to matter.