Thrashing Brontodon

Naturalize has always been a budget compromise: green's answer to artifacts and enchantments comes stapled to nothing, so drawing it against a board with no target leaves you holding a blank. This design fixes that dead-card problem by parking the destruction on a 3/4 body that blocks, trades, and attacks like a perfectly reasonable midrange creature until a problem permanent shows up. Then the sacrifice clause cashes the whole thing in. The extra mana on the activation is the friction: you pay for flexibility with an additional mana and by surrendering the body, so the question is always whether the artifact or enchantment in front of you is worth more than a 3/4. The toughness carries more weight than the number suggests, since four points survives most of the incidental damage that would pick off a utility creature before it does its job. The tradeoff for putting the removal on the board is that everyone can see it coming: an opponent holding a fragile artifact knows exactly what happens the moment you have an untapped land and a spare mana, which is the opposite of the surprise a spell from hand offers. Among green's answers-on-a-body, creatures whose pitch is a relevant permanent that doubles as insurance, this is one of the tidier builds of the idea: no upkeep tax, no conditional clause, just a quiet beater holding a destruction spell in reserve.