For those unaware flash is one of the stupidest cards ever printed. The fact you can instantly kill someone at instant speed with protection for 2 mana with protean hulk is dumb.
Anyway another card that pairs well with flash is academy rector. When academy rector dies you exile it and search for a enchantment and put it into play.
So how viable is a flash rector deck? Is it better to go for the "I win" enchantments like omniscience and eldrazi conscription or for silver bullets like energy flux and runed halo? Which colours are right to play, obviously blue for flash, white for rector, and black for tutors + viscera seer, but is it worth adding red or green?