Cavern Whisperer
Creature — Nightmare
Mutate 
(If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)
Menace (This creature can't be blocked except by two or more creatures.)
Whenever this creature mutates, each opponent discards a card.
- CMC
- 5
- Mana cost
- Color identity
- B
- Rarity
- common
- Set
- Ikoria: Lair of Behemoths
- Price
- $0.19
- EDHREC rank
- #9660
Cavern Whisperer enters with -1/-1 counters equal to the highest power among creatures on the battlefield, but that cost becomes irrelevant the moment you're looping it through mutation triggers — Otrimi, the Ever-Playful recurs it for free every combat, and the mutate ability itself fuels engines that don't care about the creature's base stats. Outside of dedicated mutation shells, Cavern Whisperer is a liability; inside them, it's a free recursive threat that Kiki-Jiki, Mirror Breaker can copy for an extra trigger before the token vanishes.
Best Commanders
Commanders with the highest synergy
Otrimi, the Ever-Playful
Cavern Whisperer is a core piece here — Otrimi, the Ever-Playful returns it from the graveyard to hand every time a mutated creature deals combat damage, creating a loop that chains mutation triggers turn after turn without spending additional mana.
Nethroi, Apex of Death
Cavern Whisperer's power is 0 after counters resolve, which means Nethroi, Apex of Death can reanimate it alongside a pile of other zero-power creatures in a single mutate trigger — it's free value in a reanimation package that cares more about the creature count than the stats.
Format Analysis
Where it lives, where it can’t
| Format | Verdict |
|---|---|
| commander | legal |
| legacy | legal |
| modern | legal |
| pioneer | legal |
| standard | not legal |
| vintage | legal |
| pauper | legal |
| oathbreaker | legal |
Cavern Whisperer is legal everywhere that matters but only sees play in Commander, specifically in mutation-tribal builds. In Pauper, Modern, Pioneer, and Legacy, a five-mana creature that enters severely weakened has no competitive application — there are faster, cleaner ways to generate value at that cost. Commander is the one format where the mutation loop engine justifies the slot, because the games go long enough for the recursive synergy to pay off and the graveyard interaction is a feature, not a footnote.
Key Combos
Combo lines featuring this card
Kiki-Jiki, Mirror BreakerCavern Whisperer
Infinite death triggers; Infinite ETB; Infinite LTB; Infinite sacrifice triggers; Infinite tapped creature tokens
View on Commander Spellbook ↗Price Context
Current price
$0.19 bulk tier
At $0.19, Cavern Whisperer is deep bulk — the price reflects its narrow playability outside of mutation decks. It won't appreciate; pick up copies freely and don't expect the ceiling to move.
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Sources
Updated . Data from Scryfall, EDHREC, and Commander Spellbook.