It wouldn't be anywhere near impossible to build a deck that beats Seism or Rainbow 50% of the time. Three decks? That may be nearer. But these are two of the hardest gods; many easier ones (Neptune comes to mind) can be beaten with a much higher win rate than 50%.
where is everyone getting 50% from? I have not said that, I actually have said that it shouldn't be that
No one said you said 50%, maybe we came up with that number.
But I think 50% is a good number for one deck, since Korugar is right in that it is much easier to beat a god with a deck specifically designed for it than with a general FG deck.
And the deck CC? Why Bother? currently holds a 63-67% win rate against ALL gods? I don't see that it can be difficult to achieve even higher numbers with certain decks against certain gods.
(I think it's been said that RoL/Hope will win against Divine Glory 90% of the time?)
Of course, some gods simply are going to be easier or harder for certain decks. Therefore, a winning percentage isn't going to be enough to determine the god's difficulty.
Then again, these are only requirements to suggest the god; nothing guarantees it will actually become one.