I'd support another spider or two only if other airborne benefits/drawbacks are ever created. We've got wings, sky blitz, shard of freedom, and iridium warden's guard that have different effects on flying creatures, and that's all, off the top of my head.
Life seems a good element for a spider, because, well... life's strong suit is creatures. I can think of a few other possibilities (some sort of tarantula thing for earth, chaos spider for entropy, shadow spider or something for darkness) but the one that seems to have the best thematics in favour of it for me is life.