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.
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Grolnok, the Omnivore (Showcase Eternal Night) [Innistrad: Crimson Vow]
Innistrad: Crimson Vow, Magic: The GatheringDesde $840
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