Spinebiter

Infect already turns a creature into a clock that counts to ten instead of twenty, but a blocker can still buy a turn by chumping. This Beast pries that escape hatch open: the optional unblockable-assignment clause lets its controller shove the full combat damage past anything standing in front of it. The decision belongs to the attacker, not the defender. After a creature blocks, you choose whether to assign those three points to the blocker (as -1/-1 counters) or to the defending player (as poison), as though the block never happened. It is a trample-equivalent narrowed to the player: the damage cannot be redirected onto some other creature, only routed around the wall to its intended target. The cost is the rate. Six mana for a 3/4 that needs to connect repeatedly is a poor curve in any deck built to race, and the poison math (three poison a swing, four swings to a kill) is slow next to the cheap, evasive threats that defined infect's most feared shells. What it offers instead is inevitability: a body that cannot be profitably chumped and that grinds toward a poison kill from a defensive posture. It reads less like a finisher than a closer for slower infect builds that have already stalled the board and want a threat the opponent cannot simply wall off.