I hardly believe this discussion.
There are three weapons that are clearly stronger than all the others:
Poesidon / Pulverizer / Eternity
Three strongest by a mile.
Infact, if you have all three of them in play, flying, with shards of readiness and quintessenced, your opponent will likely leave the game.
I have successfully used that combo in a prior version of my deck. Opponent has no lands, no permanents, no creatures in play. Complete lockdown for the win.
No good rainbow deck can be had without at least two of those three cards.