Siege Striker

Convoke run in reverse is the design here, and double strike is the multiplier that makes it lethal. A 1/1 with double strike deals two damage, forgettable on its own; the attack trigger converts a wide board into one enormous swing by tapping the rest of your creatures for +1/+1 apiece, and because that pump resolves before combat damage, every point of it hits twice. Tap three untapped bodies and you are attacking as a 4/4 that deals eight. The cost is real and it is paid in tempo: the creatures you tap will not be blocking this turn, so you are trading a defensive posture for an offensive spike, and the trigger fires only on the declared attack, so there is no instant-speed way to inflate the body to ambush a blocker or dodge a removal spell. It rewards a go-wide board that has already committed to the race, then asks that board to punch through a single point of resistance rather than grind out the long game. The math scales cleanly: a token deck built to flood the battlefield turns this into a one-card finisher, converting horizontal presence into vertical damage through a body that costs nothing to hold back and everything to attack with. A tidy piece of aggressive-white engineering: a payoff that only pays off once you have already won the board, and closes the game before the opponent can rebuild it.