Dark Depths
Legendary Snow Land
~this~ enters with ten ice counters on it.
{3}: Remove an ice counter from ~this~.
When ~this~ has no ice counters on it, sacrifice it. If you do, create Marit Lage, a legendary 20/20 black Avatar creature token with flying and indestructible.
Thing in the Ice
{1}{U}
Creature -- Horror
0/4
Defender
~this~ enters with four ice counters on it.
Whenever you cast an instant or sorcery spell, remove an ice counter from ~this~. Then if it has no ice counters on it, transform it.