the deck looks interesting but closer to table top magic, deff not legacy as its labeled. I say this because of counterswell and undermine paired with the fact that you run blue with no cantrips(brainstorm, ponder, preordain, wild cantor, chromatic star, chromatic sphere, ect...) while brainstorm is a MUST if you run blue. your mana base is another issue that could be a price constraint, that i understand. consider daze, flusterstorm, counterspell, spell pierce, brainstorm, preordain, ponder. replacing some of your current cards with these cards as they are cheap (save flusterstorm) and would automatically make your deck better.