Lets take my "Da Supa Rush" for the basic build as I believe it is the fastest Sn based rush deck.
6qq 6qq 6qq 6qq 6qq 6u3 6u3 6u3 6u3 6u3 6u3 6u5 713 713 745 77g 77g 7ae 7ae 7dq 7gm 7ju 7n6 7qb 7qb 7qb 7qb 7qb 7tf 80g
That will be our starting point. Thats 30 cards. I have 30 more cards that I can exchange. Those 5 precognitions alone give me plenty of wiggle room. Right now it is optimized for speed. To go back to my list...
-PC/Fire Shield
-PC (I hate you wings)
-Sanctuary/PA
-Purify
-Forget Maxwell Demon, Pure Rush is probably the way to go. Perhaps a pa if I fear quicksand, and slight pc for that annoying diamond shield
-Sanctuary
-Sanctuary, Shields not as important
-PC, mass CC
-ehhh, maybe PC? Healing is the only huge advantage light has... maybe some mass CC in case of rol/hope
-Cheap Creature/rewind/Sanctuary in case of GotP time
-PC. I hate permafrost shield./
A possible Sideboard would be
4x explosions
1x pulvy
1x PA
4x sanctuary
1x fire shield
2x oty
2x fire storm
3x quints
2x purify
4x black holes
6x entropy pendulums (if mark changing is allowed)
I could easily build a decent counter against most decks with that kind of variation. I could simply remove 4 precogs, and the creature of the element that would become lopsided to add in whatever I need. Then replace it with the counter that is
most likely to be successful based on the opponents element.
Notice the key word is most likely. It doesnt guarantee 100% victory, but it does give me a much better chance.