Croaking with Grolnok

One of the weirder decks I've played in a while is based on Grolnok, the Omnivore. From Crimson Vow, he has some interesting abilities:

- Whenever a Frog you control attacks, mill three cards [put three cards from the top of your library into your graveyard]

- 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.

These abilities scream 'combo deck.' The main creature cards that play well on these abilities are Willow Geist and Slogurk, the Overslime:

Willow Geist pairs exceedingly well with Grolnok. When Grolnok attacks, 3 cards bounce into your graveyard; any permanents will then bounce out with croak counters. Willow Geist's ability will trigger each time this happens, so if 2 permanent cards bounce out, Willow Geist gets two +1/+1 counters.

Slogurk grows with lands going into the graveyard, so he can also get big quickly when paired with Grolnok.

The rest of the deck features:

- Cards that expand upon that milling action (often milling cards and then returning one or more to your hand to trigger Willow Geist's ability): things like Mulch, Turn the Earth, Wasteful Harvest, Eccentric Farmer, Crawling Infestation, and Vivien on the Hunt.

- Card draw with potential milling ability (Consider, Otherworldly Gaze)

- Card draw and ramp (Joint Exploration), and

- Mild interaction (Fading Hope).

It is somewhat fun, though if you don't have at least two pieces of the combo out, it tends to fizzle. The complete decklist follows, in Arena format.

Deck

3 Grolnok, the Omnivore (VOW) 238

4 Willow Geist (MID) 207

3 Slogurk, the Overslime (MID) 242

2 Mulch (VOW) 210

1 Turn the Earth (MID) 205

3 Wasteful Harvest (BRO) 196

2 Eccentric Farmer (MID) 185

1 Crawling Infestation (VOW) 193

2 Vivien on the Hunt (SNC) 162

1 Spectral Adversary (MID) 77

1 Suspicious Stowaway (MID) 80

4 Fading Hope (MID) 51

4 Consider (MID) 44

2 Otherworldly Gaze (MID) 67

2 Joint Exploration (DMU) 56

3 Curate (BRO) 44

8 Island (BRO) 271

9 Forest (BRO) 277

1 Dreamroot Cascade (VOW) 262

2 Yavimaya Coast (DMU) 261

2 Thornwood Falls (ELD) 313