Mercedes, Kindly Devotee

First strike
Whenever Mercedes, Kindly Devotee attacks, you
may pay {w/b}{w/b}. If you do, return target creature
card with power 2 or less from your graveyard to
the battlefield tapped and attacking.
"Oh! I haven't seen any of you in such a long time!
I'm so glad to see you're alive."
(Alesha, Who Smiles at Death)