this was a good event, well run, good people, glad to have artists at an event of this size, next time I won't get 9th on breakers.
Start running a sideboard, it does not make you somehow more causal and it is an important facet of the game.
1 Narset in the maindeck
1 Karn, the great creator in the maindeck
1 Mycosynth Lattice in the Sideboard
1 Voltaic key in the sideboard (or manifold I guess, better to diversify)
1 Trinket mage feels correct for the main deck
1 Snapcaster could work as well, or alternately Mystic Sanctuary
-2 Watery Grave, -1 Underground sea, +2 Island, +1 Swamp
Lotus petal feels worse than Mox Opal to me, but that could go either way
I'd definitely say Narset is a permanent 1-of in just about any blue deck henceforth. Also helps with your timetwister if you run it. Could possibly even do some amount of Notorious Thief since you are UB already.
Thanks for your advice, I'll have to look into some of those cards.
Would it make sense to replace the jtms with a timetwister? I have one, but I'm always wary of giving my opponent 7 new cards. Sometimes when someone plays a twister against me, it helps me out.