Master of Waves wouldn't help with your devotion count because the tokens he produces don't count towards devotion. The Devotion ability states the number of, in this case, blue mana symbols in the mana costs of permanents you control... you tokens don't have mana costs... While an army blue elementals sounds awesome, if you included him to somehow ratchet your devotion count, you are quite mistaken. Also, the Domestication in your sideboard is not standard legal.
They weren't saying the tokens count for devotion. The deck is mono-blue. They are using many cards with BB in the mana cost. They were saying that Master of Waves is one of the win-cons of the deck. Oh, and Domestication is standard legal as Domestication was reprinted 2014 Core Set. Please, think before you comment.