Appa, Steadfast Guardian

Blink normally sends your own permanents away and brings them right back; airbend does something stranger. It exiles your other nonland permanents and leaves them there, cashable later for a flat two mana each, which turns Appa's enter trigger into a savings account rather than a reset button. The friction is that you are voluntarily undeploying your own board at flash speed, betting that recasting those permanents (dodging their real costs, retriggering their enter effects) is worth the tempo you spend now. The second ability is where the loop tightens: every spell cast from exile hatches a 1/1, so the exiled pile is not just cheaper mana but a token engine that pays out on the way back. Foretell, adventure, and the various exile-and-cast rummagers all feed the same trigger, which means Appa rewards a deck built around casting from anywhere but your hand rather than one built around this card alone. The flash and flying make the 3/4 an ambush blocker that can flicker a defensive permanent out of a combat trick's range and refund it later, but the real design is aggregation: airbend as a delayed, discounted mass-blink that converts board presence into deferred value and a stream of bodies. It asks you to think of exile as inventory, not a graveyard.