Mythos of Snapdaxone at it's best gives your opponent the choice to keep the best card from each type, then sacrifice the rest. But since you sacrifice as well, it's okay to good if you're winning, only good if you have a board, when you're behind, and probably not good when you're winning. For
, it becomes
Tragic Arrogance. Except Arrogance is so much easier to cast and will always be better, and it only costs
more! Really not a fan of this one.
Mythos of Illuna is interesting because you can copy any permanent, and I think I'd be happy just casting for it's base more often than not. But then again, would you rather play the Mythos or
Clever Impersonator ? I think this one's fine though.
Mythos of Nethroi is a better Murder, but that's about it.
Mythos of Vardok is actually nice at a lower power level, with the wedge bonus somewhat powerful.
Mythos of Brokkos is a double
Regrowth but worse, and becomes a Entomb+2 Regrowth and essentially Demonic Tutor+regrowth if cast for it's extra cost. Powerful, but only worth it for it's wedge cost in my opinion.
TL;DR:
White one is pretty terrible, Black and Green are fine while Blue and Red are actually decent if cast for base.