Viridian Harvest

The honest oddity here is that it doesn't kill anything. Green has its share of direct artifact removal, but this one-mana Aura sits on the artifact instead, doing nothing visible until the thing dies. The trigger fires when the enchanted artifact hits the graveyard by any route at all: your removal, the opponent cracking it for value, a sacrifice for some other cost, collateral damage from a board wipe. That makes it a passenger on attrition it didn't cause as readily as a payoff for attrition it did. Six life is the number that does the work; large enough to register as a genuine reason to run the card rather than a consolation tacked onto a spell that already won the exchange. It also reframes the opponent's decisions. A mana rock or piece of equipment wearing this Aura becomes awkward to sacrifice or trade away, because every clean way to be rid of it hands you a meaningful life swing. The strategic axis is deterrence: it taxes the artifact's controller for cracking the Treasure or feeding the engine, while sitting passively when they hold the line. That is a stranger relationship to artifact hate than outright destruction, closer to a soft-lock than a removal spell. It asks you to leave the threat on the board and profit from its inevitable end rather than answer it yourself.