Dark Depths
Dark Depths enters 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, create Marit Lage, a legendary 20/20 black Avatar creature token with flying and indestructible.
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Official rulings (3) · Scryfall
Dark Depths doesn't have a mana ability. It doesn't tap for colorless mana.
The last ability of Dark Depths is a state trigger. It won't trigger again while the ability is on the stack, but if the ability is countered and Dark Depths is still on the battlefield with no ice counters on it, it will trigger again immediately.
If Dark Depths leaves the battlefield before its triggered ability resolves, you won't be able to sacrifice it, so you won't create Marit Lage.