Night Gardener

Whenever a nonbasic land enters the battlefield by an opponent, you may search that opponent's library for a card with converted mana cost equal to or less than the number of lands that opponent controls and exile it. You may cast cards exiled in this way.
All legendary permanents are considered non-legendary. If Night Gardener leaves play, exile all legendary permanents at the end of turn.
The shadow of his tree was causes a chill.