Tall Grass

{t}: Add {c} to your mana pool
Tap an untapped creature you control: Reveal
the top card of your library. If it's a creature card
with toughness less than the power of the tapped
creature , you may put the revealed card in your
hand. Otherwise, return it to the top of your
library. Any player may activate this ability, but
only any time they could cast a sorcery.