Armadillus Saxum

Armadillus Saxum enters the battlefield tapped
{t}: Add {w} to your mana pool.
{6}{w}{w}: Until end of turn, Armadillus Saxum
becomes an 8/8 white Giant Armadillo with
vigilance. It's still a land.
Once giant, shelled creatures roamed the land and
picked on the tallest trees like flowers in a pasture.