A'zbohia's Call

Each player mills 5 cards when you cast this.
At the beginning of your upkeep mill a card, and return target creature from a graveyard. It gains
haste if it is a vampire, sacrifice it at the end
of the turn. If A'zbohia's, Caller Of Madness is
milled this way, return it from the graveyard
to the battlefield.
The wandering travelers could only dream of whatever treasures the Frost Callers attempted to hide from them by deterring them from these lands.