Glistening Symbiote

Changeling (This card is every creature type.)
Hexproof
When Glistening Symbiote enters the battlefield, mill
eight cards.
Each instant and sorcery spell in your graveyard has flashback. The flashback cost is equal to that card's
mana cost.
Whenever you cast a spell for it's flashback cost, surveil
X, where X is that spell's mana value.