How much blue with FOW

[rockdoc]

What would you say is the minimum and ideal number of blue spells in multicolored deck running FOW's?

thanks.

[AggressiveDude]

Edit:Depends on if you use power Spells and Mana Drain.

[Kasuras]

I don't think that is what he meant.

To answer your question: according to Dr. Sylvan this is the right count:

This signals that there is an ample supply of decks out there which have the recommended nineteen Blue spells to run FoW, but either lack the requisite sixteen Blue mana sources, or a purpose for running even a card as powerful as Mana Drain.

Source: http://www.starcitygames.com/php/news/expandnews.php?Article=7373

Hope this answers your question.

Edit: Changed the link to SCG so it would work link right.