I love that this is simic instead of gruul! When all you ever see is gruul after gruul after gruul, a fresh take on Pummeler is really refreshing, and by going simic, you solve one of the decks biggest problems! namely, there are only 4 copies of Pummeler. But thanks to
Trophy mage, you effectively have 8! brilliant! I say, why not take a leaf out of Death Shadow Jund's book and double down on your most powerful card! By adding Traverse the Uvenwald, you could probably get away with 18 land (between Attune, Mystic, and Traverse you have plenty of sources), and Delirium shouldn't be hard to hit in this deck (especially with either fetchlands,
evolving wilds, or the upcoming cycle lands!). Just a thought!
And if you're worried about all the 3 mana cards, you could consider
Silent Arbiter over
Crawlspace. It does what you want but even better, and blocks like a champ! And being 4 mana, it's one less card cramping the 3 mana slot XP