Nezumi Ronin

A 3/1 body advertises an attacker that trades down the moment anyone touches it, but Bushido rewrites that math during the declare blockers step. Block or get blocked and the Rat swells to a 4/2 for the turn, the bonus landing before damage is dealt, which means a lone 1/1 sent to chump it dies while the Ronin walks away. The fragile toughness is the cost of the deal: it survives combat against smaller blockers only because Bushido pumps it past the creature it just met, and it stays a liability against any noncombat damage or a removal spell cast before the trigger goes on the stack. That trade defines these early Samurai designs. They read like glass-cannon beaters on the stat line, then punish the opponent for engaging on the most natural axis the game offers, the block. Where a vanilla 3/1 forces the opponent merely to chump or take three, this one demands a real decision: eat the damage, or commit a creature that needs to be worth a 4/2 to come out ahead. The bonus stacks on defense too, where it does work a vanilla 3/1 cannot: the 4/2 trades up into a 4/4 instead of bouncing off, and shrugs off a 1/1 that would otherwise chip the toughness away. It is a small keyword doing pointed work, turning the toughness that should be a weakness into the bait that makes the attack profitable.