Nessie, Heart of Loch Ness

Nessie, Heart of Loch Ness enters tapped with
five slumber counters on it.
As long as Nessie 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 Nessie.

{t}: Add {g}{u}.