Thneedville Tree eater

Whenever This creature enters play, sacrifice it
unless you sacrifice 3 forests.
{g}: sacrifice a forest, draw a card
{g}{g}{g}: deal damage to any target equal to
the number of forests in your graveyard
Whenever this creature enters the battlefield
search your libarary for, Thneedville beast tamer
and put it into play.
Trample
Im sure its in there somewhere