Rhellen, God of the Past

Indastructible
When Rhellen, God of the Past enters the battlefield, discard your hand then draw eight cards.
As long as you have ten or less cards in your graveyard, Rhellen, God of the Past isn't a creature.
{t}: Discard a card: Draw a card.
Rhellen, God of the Past's power and toughness are equal to the number of cards in your graveyard.