Aurelia's Vindicator

Turning this face up doesn't just deploy a flier: it exiles up to X creatures off the battlefield and out of graveyards at once, at instant speed, with the size of the removal set the moment you announce the disguise cost. That timing dictates the whole shape of the card. Because a face-down flip can happen on any turn and in response to anything, the exile clause functions as a modular removal spell stapled to a body, firing when the defender least expects a flip to matter. The graveyard half quietly closes off recursion and reanimation the way any exile-based effect does, but here it arrives on a 4/2 with flying and lifelink rather than a standalone sorcery. What keeps it from being pure value is the return clause: everything exiled comes back to its owner's hand the instant this creature leaves. The removal is a lease, not a sale, which pushes the card toward tempo and toward decks that can keep the flier alive long enough for the exile to stick. Ward and the ambiguity of the face-down body (an unknown 2/2 that could be several things) both feed that protection, giving the flip a real chance to resolve before an opponent can price out the trick.