Bomb Cart

Mercenaries you control have banding.
Indestructible, Banding (Any creatures with banding, and up to one without, can attack in a band. Bands are blocked as a group. If any creatures with banding you control are blocking or being blocked by a creature, you divide that creature's combat damage, not its controller, among any of the creatures it's being blocked by or is blocking.)
If a band of 4 or more creatures with Bomb Cart in it deals damage to a player, that player loses the game.