Tybraa of the Harvest

Dredge 2
When Tybraa of the Harvest enters the battlefield, put the top X cards of your library into your graveyard. Tybraa of the Harvest's power and toughness are equal to the number of creatures cards in your graveyard.
{b/g}{b/g}{b/g}: Put the top card of your library into your graveyard, then draw a card.