Legendary Snow Land
Dark Depths enters the battlefield with ten ice counters on it.
3: Remove an ice counter from Dark Depths.
When Dark Depths has no ice counters on it, sacrifice it. If you do, put a legendary 20/20 black Avatar creature token with flying and "This creature is indestructible" named Marit Lage onto the battlefield.
Coldsnap (Rare) Coldsnap