Vol'jin, King of the Loa

Whenever one or more creatures are put into a graveyard from anywhere you gain a Loa counter.

Blessed By Bwonsamdi - Once per turn, you may
cast a creature spell from your graveyard. Its mana
cost is reduced by {x}, X is equal to the number of
Loa counters you have.

One With Rezan - {t} Each player mills cards equal
to the number of Loa counters you have.