The Green Knight

When The Green Knight enters the battlefield,
if you control a Forest , create a 0/1 green
Saproling creature token.
Spells your opponents cast that target The Green Knight cost {2} more to cast.
Whenever a land enters the battlefield under your control, if it was the third land to enter the
battlefield under your control this turn, you may
exile The Green Knight, then return him to the battlefield transformed in the Watcher in the
Woods under his owner's control