Bladebrand

The trick that turns any attacker or blocker into a wall of pins-and-needles, and refunds itself while it does it. Deathtouch granted at instant speed rewrites the block before damage is assigned: throw a 1/1 in front of an opponent's 6/6, cast this, and the trade is suddenly legal, or point a lone token at a much larger creature and let a single point of contact do the killing. The draw clause is what lifts it above a pure combat trick. Most tricks that swing a block also spend you a card, so they carry the risk of two-for-one'ing yourself when the opponent simply declines the fight; here you replace the card regardless, so the floor is a cantrip you could have held until the turn you actually needed it. That refund also opens a line the rate does not advertise: pair it with a creature that deals a single point of damage at will (a Prodigal Sorcerer and its descendants), and every ping becomes a kill, while the draw feeds you into the rest of the engine. Modest by the numbers, but the design does two clean jobs at once, making bad blocks good and small pingers lethal, and it never charges you a card to find out which.