Wall of Faith

A 0/5 body for four mana that can only raise its own toughness reads, at first pass, like a wall solving a problem it has already solved: it blocks anything short of a five-power attacker without spending a single point of mana. The activated ability does no offensive work and never points the creature forward; with no power to grow, it cannot threaten and cannot trade, only survive or die. What the pump actually buys is durability inside a window the base statline cannot cover. Against a burn spell aimed at the wall, or a swing that would otherwise punch through, white mana left open converts into extra toughness on demand, and the increments stack as long as you keep paying. That is where the design earns its slot: a five-toughness wall dies to a five-damage spell or five points of combat damage, and the ability is the answer to exactly that, letting the wall outscale a removal spell or a wide ground assault one mana at a time. It is less a static blocker than a mana sink that converts an idle turn into a guarantee the ground stays shut, a stall piece for decks with spare mana and a long game to reach.