Why is Conflux often banned in tournaments?
Solution 1:
Incredibly strong earlygame. Between Sprites 9 speed no retaliation and storm elementals ranged attack conflux can clear out neutrals in no time with no losses.
Very fast scouting, they have the fastest lvl 1 and lvl 2 units.
Armageddon strategy, four units are immune to it (fire elemental(and upgrade), phoenix (and firebird), magma elementals and magic elementals). So pretty much your entire lvl 4-7 lineup is immune to armageddon.
It's possible to build the firebird dwelling in week 1. Their high speed and growth makes them very strong
Magic university is the best building in the game. it's basically free levelups for your heroes giving them the most important magic schools.
I don't understand why you would say lvl 4-6 is not good. fire eles are average for their level, earth eles are weak, yes. But magic eles are very powerful. They are a magic immune hydra.
Ranged upgrade for air elementals can be done on day 1, it costs 1.5k gold and a few resources + a storm elemental costs just 25 extra gold. This makes conflux pretty much impossible to be rushed as you have 10-20 lvl 2 ranged creatures with no melee penalty and stats akin to a lvl 3 creature.
Also don't underestimate sprites. Yes, they die fast, but they are very fast, flying, no retaliation and have massive numbers dealing a lot of damage.
Strong heroes. Monere starts with offense and logistics, several of their casters start with a desireable magic school.
Elemental vulnerabilities and inability to ressurrect can be a disadvantage, but that's countered by their immunity to mind affecting, the no negative morale (you can mix them with whatever you want!) and their immunity to certain spells.
Phoenixes guarantee you first move.
Very fast build order. Their dwellings are very cheap (only the lvl 7 dwelling costs more than 3k gold) and you don't have to build any non-dwelling to access any of the creatures.