Grazon, Devourer of Skulls

Trample, Convoke
Duplicate all cards used to pay its {x} mana cost.
All creatures that convoked it gain indestructible.
Grazon, Devourer of Skulls, has a +3/+3 counter
for each card in your graveyard and exile piles.
When this card is put in the graveyard, put it back
in your hand and shuffle your graveyard into your library.
{t} Destroy up to two target permanents.
{b/g} Sacrafice this card.