
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.
Grolnok turns self-mill into card advantage by exiling milled permanents with croak counters so you can play them later. Attack with Frogs to mill three each combat, fill your graveyard/exile with lands and powerful permanents, then ramp and grind out a board the opponents can't keep up with. You can win through Frog tribal beatdown or by burying the table in value and big threats cast off croak counters.
Add more self-mill enablers (Hedron Crab, Mire in Misery effects, fetch-style dredge) and changelings to widen the Frog count. Include big payoff permanents worth milling and recasting, plus protection for Grolnok like Heroic Intervention and Lightning Greaves. Tighten the manabase with MDFCs and creature-lands so milled cards are never dead, and consider a compact combo finisher to close faster than pure grind.
The most-played cards for this commander, built from aggregated deck data (the Mythic Graph). Build public decks to seed it.
No combos found for this commander on Commander Spellbook.
Same color identity (GU), by popularity.