6 class buffs are terribly unbalanced
I have experimented with pretty much everything and the biggest issue I have going for 6 buffs is the availiabity of the champs.
There are 7 assassins and demons compared to exactly 6 nobles, knights and blademasters with the last champ being a legendary. Assassins and even demons (demons are actually strong) are so much easier to assemble and just as effective as the others without being dependent on a legendary. The biggest problem and disparity I find between the class buffs is the availibity and accessiblity to them.
Meanwhile I have no idea why devs think demons and even yordles are underpowered. 6 yordles is the dumbest thing I've tried so far. It's insanely overpowered and stupidly easy to get and is a perfectly balanced comp. You can instantly assemble 6 yordles and literally afk to the end. Once again the striking aspect when trying 6 yordles was the ease of assembling. However tryng to execute nobles or even demons took many tries. To be able to last long enough to achieve those 6 buffs and even managing after because you can still lose if your champs are still too weak. Figuring out how to execute those comps took work while yordles and assassins are braindead in comparison. The 6 buffs are nowhere near balanced even though it may require the same amount of champs.
Lastly I was trying blademasters and I have yet to even get to 6. The champs are too imbalanced overall. You know why fiora is so bad? Because she is too squishy with one of the lowest hp in the game when a garen pretty much does as much dmg if not more while being more tanky. It was extremely disheartening to watch just one souped up garen pretty much solo my entire blademaster team. Blademaster has been one of the hardest to start up so far and it's not even that good. Blademasters overall are so incredibly weak early in comparison and this makes it incredibly hard to get a chance to do it when pretty much any rank3 rush can zerg you down easily. Yordles, demons and even noble buffs are actually good enough to balance out early rush, but not blademasters. The buff and the champs are both too weak early to even have a chance let alone realizing that you need a useless yasuo to complete it. Don't even get me started on knights and why there even is a 6 knight buff in this game.