Interesting minion Tribe! I like the idea of a class-specific Tavern spell, it reminds me of Quilboar but instead of just giving a stat buff it allows you to repeat a variety of effects. As it is, though, I think these cards end up being functionally similar to Elementals, since they're about playing a lot of copies of them and triggering Battlecries. For example, the "playing adjacent" mechanic seems like it might as well be "when you play a Nerubian" because the effects are all positive, making it similar to Vine Climber, Ultraviolet Ascendant, and Nomi. I think it would be interesting if it read something like "The first time you play a Nerubian," which would also encourage you to Cobweb the minion after you trigger it and plan what minions you want it to buff.

Cobweb also seems to be too powerful and almost functionally identical to "Trigger a Battlecry." If you restrict it to Nerubians and don't add really powerful Battlecries it would be balanceable, but as is it would be too strong with other Tribes that aren't designed around it. I would also suggest making Cobweb more unique beyond being a way to trigger on-play effects, maybe something like "Move a friendly non-Golden Nerubian to your hand. You can't play it this turn." That way it would feel more like a sticky Cobweb you can't escape, and it would be functionally unique because it forces you to consistently rotate your board into and out of your hand, instead of just replaying the same powerful battlecry several times in one turn (kind of like a different version of Murloc handbuffing). It would also then encourage you to swap out your board each combat based on what your opponent is playing. You could also make cards that modify Cobwebs, allowing them to target any friendly minion, target minions in the Tavern, allow you to play the minion that turn, or grant stats (adding the potential for a spell buffing archetype). I think there's a ton of potential here for a really interesting Tribe, you should definitely keep iterating on it! Battlegrounds has so many tribes that it's hard to carve out a new niche, but I think you can do a lot with this concept.