**EDIT** (5/1)

-Consolidated planeswalkers into 3x Domri, Anarch of Bolas for ramp and removal

-Went down 1 Domri's Ambush and up 2 Shock, tinkering with removal

-Added back 2 copies of Rhythm of the Wild because I enjoyed its interaction with Evolution Druid and Mowu, Loyal Companion. Added 3 llanowar elves to and went down one pelty to have a more consistent opening (with a possible turn 2 Rhythm of the Wild

-Found myself wishing I had more cards in the past, putting Growth-Chamber Guardian back in to see if it helps. 

Future Considerations:

-Optimizing removal

-Optimizing 1-mana slot

-Swapping Skaargan Hellkite back in if the gods don't deliver.

Share your suggestions in the comments! Ideally by sharing strong/ weak points or suggested subs.

If you want additional inspiration here are some other decks I've been tinkering with-

Dog-Bow Midrange https://aetherhub.com/Deck/Public/105155

Mowu, Apex Doggo https://aetherhub.com/Deck/Public/104838

God-Eternal Naya Proliferate https://aetherhub.com/Deck/Public/103940

Below are my thoughts before WAR released

...

Basically what I’m hoping to play once WAR comes out. The theory behind this deck is to play good creatures that can get their own +1/+1 counters like Pelt Collector, Growth-Chamber Guardian and creatures with riot like Gruul Spellbreaker complemented with means of proliferation, specifically Bloom Hulk, Evolution Sage, and Karn’s Bastion

Cards that don’t fall into +1/+1 generators / proliferate cards-

Mowu, Loyal Companion will hopefully ETB with a +1/+1 counter with two copies each of Rhythm of the Wild and Domri, Chaos Bringer, but if it doesn’t I’ve included two copies of Domri’s Ambush to give it that initial counter before proliferate takes it away. Because this is a little harder to pull off I’ve only included 2 copies to minimize any clunkiness. 

Ilharg, the Raze-Boar - No clue if this will work well in this deck but since Gruul has so many tools to give a creature haste I’ve subbed out a copy of Skarrgan Hellkite to keep the classic Gruul Mid-Range high-end intact. The dream is to bring out a Bloom Hulk as a bulky body that proliferates when it enters the battlefield (ETB), serves as a sizable 4/4 attacker, and can be re-used later if it isn’t killed.

Finale of Devastation mainly included as a fun-of with the potential to translate being flooded into a decent sized creature (probably with haste). Time will tell if it fits well into gruul midrange!

Planeswalkers- since we’re running proliferate the uncommon planeswalkers become significantly more viable, but I minimized the number to limit non-creature draws while still having some utility.

Anarch of Bolas serves to increase our creatures threat as well as recurrent removal as we proliferate. TBD if it is worth including.

Kiora, Behemoth Beckoner - Card draw/ ramp via untapping one of our lands after use, general utility planes walker that I’m excited to try out!

Domri, Chaos Bringer - An additional way to refuel and give our creatures riot that dont normally have it. Might have a chance of using his Ult with as much proliferate as we have.

Land Base- Standard Gruul Mid-Range (without chainwhirler) but I subbed out the guild gates to make room for two Karn’s Bastion to get more proliferate on demand later in the game.

Side-board: 2 Kraul Harpooner to deal with decks with plenty of flyers. Likely should be in the main-deck depending on the meta but I wanted to lean hard into counters/ proliferate. 

2 Krenko, Tin Street Kingpin in place of Legion Warboss against control that can get a counter on itself AND quickly create a threatening board state with a ton of 1/1 goblins (that works well with Domri, Anarch of Bolas).

Cindervines Classic include against spell/enchantment dependent decks.

Lava Coil Creature-specific removal that works against particuarly pesky cards.

Fiery Cannonade for wide board states, most of our creatures will be tough enough to survive.

Vivien’s Arkbow for turning lands into more useful draws for longer/ grindy games.

Maybe board:

2 Vivien Reid Should probably be in the main/side-board, but with all the new planes walker removal I’m cautious about paying 5 for a planeswalker, 4-cost Domri is already borderline. Plus we have cards like Vivien’s Archbow and Kiora, Behemoth Beckoner to give us additional draw/value without slowing us down too much.

Bond of Flourishing *Might* be an auto-include in green decks if aggro is king, but for this decklist I’m worried it might be too slow. Also not sure what I would cut to make room.

Rekindling Phoenix It doesn’t have inherent synergy with proliferate so I’ve left it out buuuutt until standard rotates any mid-range deck that runs red will likely want this main-decked. TBD if proliferate does enough for us that this card isn’t necessary, but I imagine I’ll be including this back in the future.

Let me know what you think about this decklist and what WAR cards you’re excited to brew with in Gruul lists! If you suggest adding a card also including what you’d take OUT would be great!

Best of luck at Pre-Release!