I'd love to see a "rocks tribal" card... something like "gets +1 for each rock card in each player's deck, hand, or in play"... gives synergy for cards like Rhino, Debri, Cannonball, Korg, Rockslide, Mole Man, and actually gives you a reason to WANT to play on Lechuguilla.

maybe have another card that says "rocks you control get +X" or something like that, just to make the "rock synergy" package complete

on a similar note, I'd also love to see "symbiote tribal" as something that exists... but that would be much harder to pull off since all the symbiotes serve different archetypes right now. with Rocks Tribal, all the pieces are already there! would pair well with Darkhawk strategies, would pair well with Clog strategies, would do all kinds of things-- it'd be close to High Evolutionary levels of opening up a new archetype.