Undead Warchief [Scourge] Duels of the Planeswalkers Promos 2010 Scholars say that arbiters exist

Scholars say that arbiters exist on every world

At the beginning of that turn's end step

Set: Beta Edition Type: Instant Rarity: Common Cost: {R} Cast this spell only during the declare blockers step

Set: Alpha Edition Type: Creature — Plant Wall Rarity: Uncommon Cost: {2}{G} Defender (This creature can't attack

Servant of Oni deals combat damage to a player

Undead Warchief [Scourge] Duels of the Planeswalkers Promos 2010 Scholars say that arbiters existSet: Scourge Type: Creature Zombie Rarity: Uncommon Cost: {2}{B}{B} Zombie spells you cast cost {1} less to cast. Zombie creatures you control get +2 +1. It has the strength of seven men. In fact, it used to be seven men.