Artemis, Moonlight Huntress

Deathtouch, indestructible, reach
After each declare blockers step, but before dealing combat damage, if Artemis attacked this turn, you may untap her and remove her from combat. If you do, she deals damage equal to her power to target creature the defending player controls. When that creature this turn dies, exile it instead of putting it into its owner's graveyard and you gain 2 life. Put a +1/+1 counter on Artemis.