Aven Interrupter

White never got the raw counterspell, so its answers to the stack have always taken oblique shapes: a Dawn Charm redirection, a Silence, a Rebuff the Wicked. This one takes the shape further than most by refusing to actually deny the spell. The exile-and-plot clause pulls the target off the stack and hands it back to its caster to recast on a later turn, so the trade is pure tempo: three mana at flash speed buys a full turn cycle while a 2/2 flier stays behind to pressure the board. The wrinkle is that the two halves of the card talk to each other. Because the plotted spell is now cast from exile, the second ability taxes it as long as the Bird sits on the battlefield. So "recast for free" is a trap the caster walks into: the spell you gave back is not free, it is late and taxed, and killing the Interrupter to dodge that tax means spending removal you would rather aim elsewhere. That second ability is the quieter menace anyway, a standing surcharge on every graveyard-cast and exile-cast spell an opponent reaches for, which is precisely where flashback, escape, foretell, adventure, and the growing pile of cast-from-exile value all live. Two distinct flavors of interaction, a soft counter and a recursion tax, out of one three-mana body that ambushes at instant speed.