Retaliation

Most green effects reward the attacker who can't be stopped: trample, evasion, raw size that makes the block a losing trade for the defender. This one inverts the logic by rewarding interruption. Throw the team into the red zone and every creature the defender steps in front of grows, which turns blocking from a clean trading tool into a tax. A would-be one-for-one block instead hands you a bigger creature that wins the exchange; a chump block meant to soak a hit now faces something that punches through it anyway. The buff is a triggered ability granted to each of your creatures, firing the moment one becomes blocked: no mana to pump, no upkeep cost once the enchantment is down, and the +1/+1 stacks across the whole board for free. Its limitation is its passivity. With no creatures out it sits idle, against a defender who simply takes the damage it sits idle, and on a swing that goes unblocked it sits idle. It converts only the opponent's defensive choices into your advantage, which makes it a board-presence enchantment wearing the costume of a combat enabler. It punishes a behavior the opponent is normally free to do without consequence, which is a narrow lever but a real one: against a wall of small blockers, a wide green board with this in play forces the defender to either feed creatures into bad trades or let the beats through.