Actually, Sniper WAS available a while back, don't know what happened to it, maybe Zan thought it too OP even though it was really rare to get, but I agree, having the Queen ability would be a nice thing to have too.
As for the momentum ability, I've noticed that if a creature has a flash around it, then if you mutate it with it getting the momentum ability, then that will be its ability coster. I've noticed this especially with creatures with sucky abilities that were still usable, then I mutate it and get a creature with like..."3 L: momentum" or something like that.