Serkhet

Vigilance, Wither

Liche Priest Of Ptra - You may pay {0} to cast
Skeleton Creatures if you have 5 or more Exiled
Creatures.

{t}: Whenever a Creature you control enters the Battlefield from Exile, draw a card.

Once per turn, whenever a Creature you control is Exiled, add {w}{b} to your Mana pool.