Hulkbuster Armor

The Equip Hero line is the whole design conceit made mechanical: this is a suit that only comes cheap when a person is inside it to wear it. Strap it to any Hero and the armor snaps into place for three; hand it to something that lacks that legacy and the cost balloons to six, roughly double, a friction that stops the equipment from being a generic finisher stapled onto the nearest fat body. What it does when it attaches is unusually blunt for Equipment: it does not add to a creature's stats, it overwrites them. Base power and toughness become 9/9, so it papers over a one-drop's frailty and, in the same motion, erases whatever gaudy numbers a bomb was already carrying. That overwrite is the wrinkle worth planning around: it turns your smallest legal Hero into a flying 9/9 and turns your biggest one into a downgrade. The flying is what makes the body actually close a game rather than just stand in the way. As a piece of Equipment lineage this sits with the cards that redefine a creature outright rather than pumping it, the Ensoul Artifact school of "the body no longer matters, the aura does," except here the aura walks off when its bearer dies and can be reattached, and it rewards you for keeping a stable of cheap, disposable pilots rather than one irreplaceable one.