Loki, the Trickster

Flash
{2}{u}{b}, Return an unblocked attacking
Warframe you control to its owner's hand:
Put Loki, the Trickster from your hand
onto the battlefield tapped and attacking.
Whenever Loki, the Trickster deals combat
damage to a player, you may put target
permanent card from that player's graveyard
onto the battlefield under your control