BG Sacrifice is the home, and the pick window is narrower than the auto-attach trigger suggests: P2P5 to P3P3 in a deck already drafting Disappear payoffs and Food synergies, much later otherwise. Treat it as maindeck only when you can count five-plus expendable permanents in the pile, otherwise a sideboard card against grindy mirrors where a free +2/+1 swings combat math.
The format physics work against the equip cost more than the auto-attach helps. TMT runs at medium speed with common bodies clustered at 2/2 and 2/3, so the first attach genuinely matters: it turns a 2/2 into a 4/3 that brawls above the common toughness line and threatens a three-turn clock. The problem is the second attach. Sacrificing a nonland permanent once per turn sounds free in a sacrifice shell, but the format's actual sac fodder is thin at common outside Food tokens, and Food wants to be eaten for its own value. Disappear creatures sacrifice themselves on their own trigger, which means they are not available as Armor fuel; the two engines compete for the same creature rather than feeding each other.
The cleanest fit is a BG build with multiple Food generators where the Armor lives on a single threat all game and the equip cost is a contingency, not a plan. Against Stomped by the Foot the host dies and the Equipment stays, the rare upside: you have already banked the +2/+1 worth of damage, and the next creature inherits the gear for the price of a token. Grounded for Life ignores the buff entirely; it destroys the creature regardless of its propped-up toughness, and gets cheaper if your attacker is already tapped. The Armor never saves a host from removal. It only ever banks the damage you already dealt.
