Lightfoot Rogue

The whole card is a bet on the swing itself, and the design's cleverness is that even the worst outcome pays out. Deathtouch is guaranteed on any attack, so the floor is a two-mana creature that punishes any block: every point of damage becomes lethal, which forces blockers to think twice about a body they would otherwise gang up on. The d20 roll layers texture onto that baseline, a modest bump in the middle band and a genuine finisher at the top. Rolling a 20 turns the 2/1 into a first-striking, deathtouching attacker that ends games, because first strike plus deathtouch means the attacker resolves its damage before the blocker can respond, and any creature it hits dies before dealing a point back. There is no trample here, so a big roll into a blocker kills the blocker rather than pushing damage through; the payoff is board control and a clean removal-in-combat, not a life-total hit while blocked. The Sneak Attack flavor frames the whole thing as opportunistic assassin work, the halfling slipping past a guard and choosing how badly to hurt whatever it finds. What holds the design together is that the deterministic effect and the random one point the same direction: you always want to attack, and the roll only decides how much reward the attack earns.