Celestial Dawn is terrible if you are building a control deck with Sen Triplets. Just have a better mana base for your deck and you don't need this. Also, I understand your reasoning on Telepathy, but it's not that necessary. Sen Triplets' ability is enough. You could instead put in removal, a counter, or even a wrath type card. Maybe Supreme Verdict?
I also think every control Sen Triplets deck should run Boseiju, Who Shelters All. It keeps your counters, removal spells, and any other any important response cards or wraths safe from getting countered.
I also think every control Sen Triplets deck should run Boseiju, Who Shelters All. It keeps your counters, removal spells, and any other any important response cards or wraths safe from getting countered.