Marit Lage, Slumbering Horror

Marit Lage enters the battlefield with an ice
counter on her.
Marit Lage can't attack or block as long as she has
an ice counter.
Flying, indestructible, hexproof.
{b}{b}: Create a 1/1 Tentacle creature token with defender, then if you control 10 or more Tentacle creatures, sacrifice them and remove all ice
counters from Marit Lage.
After lifetimes trapped, her arrival was announced with cracking of ice and screams of Dominaria.