Creeping Mold hits lands, but unless somebody's running The Tabernacle at Pendrell Vale in your meta, I would just run Nature's Claim or Return to Nature.
I would also suggest leaning into either big green or voltron to tighten up your strategy. I wouldn't put cards like Champion of Lambholdt and Loxodon Warhammer in the same deck.
Thanks for the tips! I like the idea of going big, because I've found that strategies that solely rely on the commander are pretty tough to
execute on. I typically just play 1v1, and sometimes with 2 other people. We aren't a super competitive group either. I like the idea of being able to swing with Omnath and trample for funsies, and use strong crits like
pathbreaker ibex or
siege behemoth to assist, but also feel more comfortable when there are alternate strategies assuming Omnath is not around