Arixmethes, Sumbering Isle

Arixmethes, Slumbering Isle enters the
battlefield tapped with five slumber counters on
it.
As long as Arixmethes has a slumber counter on
it, it's a land. (It's not a creature.)
Whenever you cast a spell, you may remove a
slumber counter from Arixmethes.
{t}: Add {g}{u}.