Zane the Firebane

Zane the Firebane's power and toughness are
each equal to the number of cards in your
opponents' graveyards.
Whenever you cast a spell, each opponent
reveals cards from the top of their library until
they reveal a land card, then puts those cards
into their graveyard.
If 3 or more Denizens are on the battlefield, all Denizens get +5/+5.