Rottenmouth Viper
Creature — Elemental Snake
As an additional cost to cast this spell, you may sacrifice any number of nonland permanents. This spell costs 
less to cast for each permanent sacrificed this way.
Whenever this creature enters or attacks, put a blight counter on it. Then for each blight counter on it, each opponent loses 4 life unless that player sacrifices a nonland permanent of their choice or discards a card.
- CMC
- 6
- Mana cost
- Color identity
- B
- Rarity
- mythic
- Set
- Bloomburrow Promos
- Price
- —
- EDHREC rank
- #2860
Rottenmouth Viper taxes every opponent's hand on entry and keeps taxing on attack — opponents discard or take damage each time it connects, and that pressure compounds fast at a four-player table. Aphelia, Viper Whisperer is the obvious home, but any deck that wants sustained hand disruption gets real mileage out of a five-drop that never stops working.
Best Commanders
Commanders with the highest synergy
Aphelia, Viper Whisperer
Aphelia, Viper Whisperer is literally designed around Rottenmouth Viper — Aphelia cares about Snakes and poison-adjacent pressure, so the Viper slots in as a core piece rather than a support card, showing up in over 62% of Aphelia lists.
Ashling, the Limitless
Ashling, the Limitless wants bodies that punish opponents for breathing, and Rottenmouth Viper's repeated discard-or-damage trigger fits that harassment gameplan well enough to land in over 22% of Ashling decks.
Zoyowa Lava-Tongue
Zoyowa Lava-Tongue rewards hand disruption by generating value whenever opponents are forced to discard, so Rottenmouth Viper's attack trigger feeds directly into Zoyowa's engine.
Araumi of the Dead Tide
Araumi of the Dead Tide can Encore Rottenmouth Viper to create multiple attacking copies, multiplying the discard-or-damage trigger across every opponent simultaneously for a devastating mid-to-late-game swing.
Valgavoth, Terror Eater
Valgavoth, Terror Eater grows on opponents losing life, and Rottenmouth Viper's damage mode puts that clock on every opponent's hand every combat — the synergy is straightforward and effective.
Format Analysis
Where it lives, where it can’t
| Format | Verdict |
|---|---|
| commander | legal |
| legacy | legal |
| modern | legal |
| pioneer | legal |
| standard | legal |
| vintage | legal |
| pauper | not legal |
| oathbreaker | legal |
Rottenmouth Viper is legal across every major constructed format but finds its best home in Commander, where four opponents mean the enters-the-battlefield trigger hits three targets at once and every successful attack applies pressure at scale. In 1v1 formats like Modern or Pioneer, a five-mana 4/4 that makes the opponent discard one card is too slow and too replaceable against efficient threats and counterspells. Legacy and Vintage have the same problem with interest — the raw power bar is set too high for a five-drop with no immediate board impact beyond a single discard. Commander is the one format where Rottenmouth Viper's math actually works in its favor.
Key Combos
Combo lines featuring this card
Price Context
Current price
unknown tier
Pricing data for Rottenmouth Viper isn't available at the moment, so check Scryfall or TCGPlayer for a current number before buying. Given its strong showing in Aphelia, Viper Whisperer decks and reasonable play across several other commanders, it's worth checking whether supply has caught up with demand.
Explore
Sources
Updated . Data from Scryfall, EDHREC, and Commander Spellbook.