Edelgard, Lady of Adrestia

Reach, Trample
Whenever Edelgard, Lady of Adrestia deals combat damage to a player, you may have her deal 2 damage to target creature or planeswalker. If that permanent were to die this turn, exile it instead.
At the beginning of your upkeep, if 4 or more cards were exiled this way, exile target opponent's graveyard, and transform Edelgard.