Cheapest priced copy (Edge of Eternities): $0.35 at Card Kingdom, near mint, their price list as of .
Mouth of the Storm 
Creature — Elemental · 6/6 · Uncommon · Edge of Eternities · #70
Flying
Ward {2} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {2}.)
When this creature enters, creatures your opponents control get -3/-0 until your next turn.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Edge of Eternities | 70 | Uncommon | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 25 July 2025Mouth of the Storm’s last ability affects only creatures your opponents control at the time it resolves. Creatures they begin to control after the ability resolves but before your next turn begins won’t get -3/-0.