I like your idea, but I'm really scared of Hymn to Tourach decks to be honest. Also, the new breed of Mono (more or less) blue decks have millions of counterspells, and resolving High Tide and untap effects is key.
Even if they assume you have FoW, they will still Hymn you and/or counter your key spells. I want to believe in your idea, but I'm not sure how it would work.

