This slot encompasses Lunarch Veteran, Soul Warden, Soul's Attendant, Hinterland Sanctifier, and any other Soul Sisters cards with this effect, especially at 1 mana
If you don't play the exiled card, it remains exiled
A great play pattern would be to cast Maha first (let's say your commander was removed once already), then play The Reaper, targeting your enemy's best creature and nicking it right away
For example, you can attack Larry with this creature, Mary with that one, and yourself with a thirdand all three are killed by blockers
Knock yerself out
Enchantment - Aura Color tag templates(None) Haunted One Commander creatures you own have "Whenever this creature becomes tapped, it and other creatures you control that share a creature type with it each get +2/+0 and gain undying until end of turn." (When a creature with undying dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.) Legendary Enchantment - Background Color tag templates(None) Leyline of Anticipation If this card is in your opening hand, you may begin the game with it on the battlefield