Salvation Swan

The engine runs on a delayed return, and that delay does the load-bearing work. Every Bird that enters, this one included, lets you exile a grounded creature you control and bring it back at the beginning of the next end step with a flying counter. Because the return waits until end of turn, the promoted body sits out the combat you cast it in: no attack, no block, no damage that turn. The flash makes up for it by handing you the exile at instant speed, so you can respond to lethal combat math or a targeted removal spell and watch the creature vanish and reappear untouched. That double duty is the point. It reruns an enter-the-battlefield ability and gives the returning permanent evasion it did not have, so a single trigger can bank an ETB plus flight; point it at nothing and you still get a 3/3 flash flyer to ambush with. Where an ordinary flicker like Ephemerate returns a creature exactly as it left, this one changes what comes back, upgrading the permanent's evasion profile instead of merely resetting it. The promotion runs one direction only: the ability can target a creature only if it lacks flying, so once a body comes back airborne it is no longer a legal target for later triggers. The ceiling arrives on a wide Bird board, where each successive entry rotates one more grounded creature skyward.