All-Seeing Arbiter
Flying Whenever All-Seeing Arbiter enters the battlefield 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.
Creature — Avatar
standard:
legal
future:
legal
historic:
legal
gladiator:
legal
pioneer:
legal
explorer:
legal
modern:
legal
legacy:
legal
pauper:
not legal
vintage:
legal
penny:
not legal
commander:
legal
oathbreaker:
legal
brawl:
legal
historicbrawl:
legal
alchemy:
legal
paupercommander:
not legal
duel:
legal
oldschool:
not legal
premodern:
not legal
predh:
not legal
High - Low