Mexrakul the Hungry

Mexrakul costs {1} less to cast for each card
type in your graveyard
Flying, Trample, Hexproof
As Mexrakul enters the battlefield, put X Hunger Counters on it
At the beginning of each upkeep, sacrifice a
permanent or remove a Hunger Counter from Mexrakul
When Mexrakul has no Hunger Counters on it, sacrifice it