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Grolnok, the Omnivore

Legendary Creature — Frog

Whenever a Frog you control attacks, mill three cards.
Whenever a permanent card is put into your graveyard from your library, exile it with a croak counter on it.
You may play lands and cast spells from among cards you own in exile with croak counters on them.

CMC
4
Mana cost
{2}{G}{U}
Color identity
GU
Rarity
rare
Set
Innistrad: Double Feature
Price
$1.81
EDHREC rank
#6289
Buy on TCGplayer
Grolnok, the Omnivore card art
Grolnok, the Omnivore turns every frog that dies into a free cast off the top, which means pairing it with self-mill loops like Cephalid Illusionist can empty your deck and fire off spells at zero cost. Clement, the Worrywort is the cleaner commander shell for this — but as a 99 piece, Grolnok earns its slot anywhere frogs hit the graveyard at scale.

Best Commanders

Commanders with the highest synergy

01
Clement, the Worrywort

Clement, the Worrywort

49.3% of decks · synergy 0.47

Nearly half of all Clement, the Worrywort decks run Grolnok, the Omnivore because both cards reward piling things into the graveyard — Clement fuels the mill engine and Grolnok converts that mill into free spells, creating a self-sustaining loop that can take over a game.

02
Tatsunari, Toad Rider

Tatsunari, Toad Rider

23.8% of decks · synergy 0.22

Tatsunari, Toad Rider builds around casting enchantments to generate frog tokens, and Grolnok, the Omnivore turns those same frogs into a value engine the moment they trade in combat or get sacrificed.

03
Glarb, Calamity's Augur

Glarb, Calamity's Augur

21.0% of decks · synergy 0.19

Glarb, Calamity's Augur wants a stocked graveyard to cast spells for free at the start of combat, and Grolnok, the Omnivore stacks croaked counters every time a frog dies — the two abilities feed each other across multiple attack steps.

Format Analysis

Where it lives, where it can’t

FormatVerdict
commander legal
legacy legal
modern legal
pioneer legal
standard not legal
vintage legal
pauper not legal
oathbreaker legal

Commander is where Grolnok, the Omnivore does its best work, either as the general of a self-mill frog tribal deck or as a value piece in any blue-green graveyard shell. The three-mana cost is easy to hit, and the mill-into-free-cast engine scales well with a 99-card deck's natural redundancy. Grolnok is legal in Legacy, Modern, Pioneer, and Vintage, but sees virtually no competitive play in those formats — the effect is too slow for anything other than a niche casual or combo shell, and frog tribal has no meaningful presence in 60-card constructed. Oathbreaker is a reasonable home if the signature spell supports a self-mill angle, but Commander remains the clear best fit.

Key Combos

Combo lines featuring this card

Price Context

Current price

$1.81 cheap tier

At $1.81, Grolnok, the Omnivore sits in the cheap tier — fair for a card with genuine combo upside but a narrow tribal identity. It's the kind of card that could tick up slightly if frog tribal ever gets a pushed new piece, but at current demand there's no pressure to move on it urgently.

Explore

Sources

Mentioned

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Updated . Data from Scryfall, EDHREC, and Commander Spellbook.