Bonded Herdbeast // Plated Kilnbeast

A defensive 4/5 that can commit, permanently, to becoming an evasive menace threat: that is the arc, and the one-way flip is what makes it read as corruption rather than a toggle. The back face carries no transform ability, so once this creature compleats it stays compleated, the flavor of the transformation written into the rules instead of pasted on top. The lever is the red-or-two-life clause in the activation. A deck touching no red at all can pay the four generic and bleed two life to trigger the change, folding the theme of corrupting influence directly into the math you do to activate it. That is the whole point of pricing an effect in life rather than color access: it lets the transform live in decks that would never run a second color for it. The sorcery-speed gate keeps the front face honest on defense. You cannot flip mid-combat to dodge a blocker or ambush an attacker, so the 4/5 has to hold the ground it is given, and the decision to compleat is a proactive main-phase commitment rather than a combat trick. The tension it resolves is a narrow but real one: how do you let a noncolor deck still pay a red cost, and how do you make that payment feel like paying a price rather than dodging a restriction.