Children of the Forest

Forestwalk
Whenever Children of the Forest deals combat
damage to a player, look at the top two cards of
your library. Put any number of them into your
graveyard and the rest back on top of your
library in any order.
Threshold—As long as seven or more cards are
in your graveyard, Children of the Forest has
"{t}: Add {b} or {g} to your mana pool."