Renegade Bull

A 0/5 with no innate offense is a strange chassis for a spellslinger finisher, and that inertness is deliberate. The two triggers pull in opposite directions and meet in the same combat step. Cast a spell and the body gains power equal to that spell's mana value, so the wall that reads zero attack becomes lethal the instant something expensive is cast; five toughness means it lives to keep swinging while the deck grinds. The attack trigger then completes the circuit: exile an instant or sorcery card from your graveyard, copy it, and cast the copy for free. That copy re-triggers the pump before damage, so recasting a fat sorcery mid-combat stacks its mana value onto an already-growing body.

The design lesson sits in how the halves depend on each other. Most spell-matters creatures pick a lane: a fragile enabler that dies to any nudge, or a beater indifferent to your noncreature spells. This one refuses to choose. It is a defensive shell that only converts into a threat through the spells you were already resolving, and the graveyard recursion means a copied bomb hits as hard as the original. Trample is the enforcer clause, insisting the piled-up power actually connects rather than dissolving against a lone chump blocker. Left alone, the ox is furniture; hand it something to throw and it throws the whole graveyard.