Danevay and Aiyana, Pilferers

Flying, menace
Whenever Danevay and Aiyana, Pilferers attacks,
exile target card from defending player's
graveyard. You may cast that spell this turn, and
mana of any type may be spent to cast it. Then,
if it would go to the graveyard, exile it instead.
For Thra! (You can have two commanders if both
have For Thra!)