What are you on about?
Nomi is not very good, you need him very, very, very early and certainly a 2nd one to actually close out lobbies. Rag is slightly better, but again you'll likely need a couple of them and rag is NOT an elemental exclusive, in fact it's better to have some menagerie units with him, hydra, foe reaper, deflect-o ect.
Pirates have arguably the best and quickest scaling in the game, when they hit, but they are the hardest to hit since you ideally need 4 hoggers to pull it off. The scallywag/eliza build is a bit of a meme but can do work and has considerably stats when it goes off properly.
Dragons, they are undeniably the best tribe in the game right now, you have excellent scaling with kaly and you get a board of divine shields thanks to nadina, which no other tribe can get.
Murlocs, poisons give them infinite attack and there's seer and bagurgyl that give HP scaling to the entire board, obviously you want brann with murlocs for very high scaling.
Beast/mech/demons are probably worse than elementals for late game scaling since they all have lower ceilings, but elementals are a long way from being op.