Skyfire Kirin

The Kirin cycle paid off the spellcasting subtheme of its era, and this one turned that payoff into temporary theft. Trigger the ability and it points at a creature whose mana value matches the spell you just cast, handing it to you until end of turn. That mana-value clause is the hinge of the design: the spell you choose effectively names the size bracket of what you can borrow, so the theft is filtered through whatever your hand can pay for. A cheap Arcane trigger pulls a one-drop; a heavier cast reaches for something bigger across the table. But note what the ability conspicuously withholds: it grants control alone, no untap, no haste. Unlike a true Threaten effect, the borrowed creature arrives tapped if it was tapped and cannot swing without an outside haste enabler. The intended payoff is the sacrifice outlet, not the attack step: take control, feed it to something, and the loan is never repaid, since control reverting at end of turn means nothing once the creature is gone. As red design this is unusual. Red's temporary-control tradition typically charges mana per activation; this charges nothing beyond a spell you wanted to cast anyway, then quietly clips the haste that would otherwise turn the borrowed body into damage. The 3/3 flier is a serviceable clock on its own, but its real role is as a free rider on a tuned spellcasting deck: every cast becomes a chance to remove a blocker, steal a finisher, or strip a board for a sacrifice loop.