Graveyard Wanderer

Nonbasic landwalk, Shroud, Flash
When Graveyard Wanderer enters the battlefield
from your hand, count every card in every players Graveyard, then put X 0/2 Colorless Headstone
Wall Creature Tokens with Banding onto the battlefield, where X was the amount of cards.
{p/b}{p/w}: Put a -1/-1 or a +1/+1 on target Permanent.
Pay 2 Life: Scry 2