You are almost certainly firing off the Insight at this point but are you doing it before the Pyromancer in the hope of finding a better selection of things to cast
Kitsas not a bad card per se, but it lacks an additional color outside of blue, locking you out of 12 of the 19 otter creatures
Two mana is a lot to hold up, and given that most wins in cEDH often present themselves from situations where a player bursts ahead rather explosively, odds are that any time a player is going to win youll either wish for a narrower, but more efficient, one-mana counterspell (Miscast, Dispel, etc.), or just a plain old Silence
Furthermore, you can search it out of the deck with Urza's Saga, which helps the consistency of these decks quite a bit
The ability to also search any snow permanent makes it great for snow decks because it can go from being a ramp card to a tutor that finds something like Icebreaker Kraken
She leans into a very thieving style of gameplay, where the goal is not just to remove your opponents cards, but to use those cards against them