Black Knight [International Collectors' Edition] Alpha Edition Scholars say that arbiters exist

Scholars say that arbiters exist on every world

Set: Judgment Type: Enchantment Rarity: Rare Cost: {2}{W} At the beginning of your upkeep

Set: Portal Three Kingdoms Type: Creature — Cat Rarity: Uncommon Cost: {2}{G} Whenever Trained Cheetah becomes blocked

Set: Magic Origins Type: Artifact Rarity: Uncommon Cost: {3} Whenever a creature enters the battlefield under your control

"With precise coordination and enough blood spilled

Black Knight [International Collectors' Edition] Alpha Edition Scholars say that arbiters existSet: International Collectors' Edition Type: Creature Human Knight Rarity: Uncommon Cost: {B}{B} First strike (This creature deals combat damage before creatures without first strike.) Protection from white (This creature can't be blocked, targeted, dealt damage, or enchanted by anything white.) Battle doesn't need a purpose; the battle is its own purpose. You don't ask why a plague spreads or a field burns. Don't ask why I fight.