All-Seeing Arbiter

Creature — Avatar — {4}{U}{U}

Flying
Whenever this creature enters or attacks, draw two cards, then discard a card.
Whenever you discard a card, target creature an opponent controls gets -X/-0 until your next turn, where X is the number of different mana values among cards in your graveyard.

Rarity: mythic

EDHREC rank: 11459