Mystic Forest

Your commander costs {2} less to cast for each
time it's been cast from the command zone
this game.
Whenever your commander is put into the
command zone from anywhere, draw a card and
search your library for a creature card, add it to
your hand. Then shuffle your library.
Whenever a creature enters the battlefield, search
your library for a Forest card and put it onto the Battlefield. Then shuffle your library.