Barreling Attack

Punishing overcommitment is the whole idea here: trample is the delivery mechanism, but the payoff is the swarm of bodies a defender throws in front of the threat. Granting trample alone would barely justify four mana, since it only matters when an attacker is large enough to spill damage past whatever blocks it. The conditional growth is what flips the math. Each creature committed to the block adds +1/+1, so the multi-block that should swallow an attacker instead inflates it, and the surplus plows through to the player. Value scales with the opponent's confidence rather than your own board.

The timing is the catch, and it rewards a clean read rather than a late ambush. The bonus triggers off the "becomes blocked" event, which means the spell has to be on the stack before the declare-blockers step; cast it after blockers are locked in and that event has already passed, leaving you with a bare trample-granting instant and nothing else. So casting it early telegraphs the trick, inviting a cautious defender to send one blocker or none, while the reward only lands if you correctly predict a gang-block before it happens. That tension, baked into a 1996 instant, asked players to think about how defenders allocate blockers, not just whether attackers connect: a piece of mid-90s combat design more interested in the defender's decision than the attacker's swing.