Dark Summoner

•When a nontoken creature dies, you may sustain
one mana to summon a 2/2 Zombie to your
side of the field.
•You may play creatures from any player's
graveyard. Use that creature's CMC for
mana cost.
•You may spend an Adventurer's CMC to return
them to play with X life. X is equal to the
extra mana used to activate this ability.