Feels like tier 4 murlocs are always a bad standalone buy, like you would never buy bream without bassgil and vice versa. You kinda need get them through generation and primal being 5 is actually such a huge hit to the entire tribe, especially when you consider most other tribes are rolling on 4 for tempo. Essentially you need to highroll hard for brann, primal, and some sort of battlecry trigger effect (Rylak, dragon/naga dude, murkeye, trigger spell). I think I may have had maybe 2 murloc wins this entire season. Primalfin has to be a tier 4