Obsidian Acolyte

Built for one matchup and not shy about it. This is a piece of dedicated hate priced for the aggressor: a white body that black removal cannot touch, plus a mana sink that hands the same immunity to anything else on your side. The repeatable activation is the part worth dwelling on, because protection from black is not just damage prevention here; it shrugs off Terror, Dark Banishing, and the other targeted black kill spells of an era when heavy black control sat near the top of the metagame, and it negates the "can't block" tricks black leaned on. Granting it at instant speed means the immunity lands after the opponent has already pointed a removal spell and committed the mana, which turns a one-mana white tax into a recurring blowout against any black deck forced to aim at your threats. The cost is narrowness: against a black-light field this is a 1/1 with a dead ability, and the grant does nothing about sweepers or non-targeted effects. That is the trade the color-hoser cycle this belonged to accepted across the board, offering a sharp answer to one color in exchange for being filler against the other four.