Bloodfire Enforcers

A 5/2 for four is glass by default, and this one stays glass until you earn the upgrade. The whole proposition is that it reads a specific graveyard state rather than a single trigger: one instant and one sorcery sitting in the yard, at which point first strike and trample turn a fragile two-toughness beater into something that profits from blocks instead of dying to them. That gating is the tax that keeps the rate honest, since a 5/2 with first strike and trample for four would be aggressively pushed unconditionally. The condition is checked continuously, not on a single event, so the keywords blink off the moment a graveyard-hate effect strips the yard or a recursion spell pulls the wrong card back, then snap on again once the requirement is restored mid-combat. It rewards a deck already built to sling spells, the kind that wants a hard-hitting body to ride while the pilot churns through removal and card draw and naturally fills the yard with both halves of the requirement. The design sits in the small family of creatures that treat your graveyard's composition as a power switch, and the demand for two distinct card types (not just any two cards) is what stops the upside from being free.