Vhodhr'dhri, Soul of the Moon

As an addition cost to cast this creature, sacrifice
three other creatures.
{4} Add a Madness counter to any permanent.
{7}{t} Exile any number of Permanents with
Madness counters on it.
you may cast up to three of these on your next
upkeep without paying the mana cost.
"Give into the madness, and i will grant you
strength like which you have never seen."