Turn 4 Dragonstorm.... sometimes turn 3 if you play the dig cards with precision... if not then turn 5.
It is a gimmicky deck but it is fun to play in modern.
This deck is still sorta in its testing and tuning phase as I'm trying to find is healthy consistent set up.
How to use this deck is to just use blue to dig as deep into the deck as you possibly can and dig out a dragonstorm card and as many mana ramps as you can.
Index is the real important card here because if you get it in the first hand with probe you could essentially put down a Lotus bloom on turn 1 as well as order the cards in the priority needed so that you could cast dragonstorm on turn 3 or 4.
Don't be afraid to lose life for free digs with the probe. Even if you don't get a Lotus Bloom turn 1 it could still ramp on turn 4 just try to dig deep in the deck and don't forget to arcane splice Desperate ritual. Also use See Beyond to shuffle any dragons you accidentally dig up. Use index to prioritize order the card draws.
Ignore the "maybes" as they are mostly just cards I was viewing for other deck ideas.
To cast Dragonstorm:
Lotus Bloom OR Goblin Electromancer 3xLand 3xRituals OR 2xDesperate Rituals
Lotus Bloom OR Goblin Electromancer 4xLand 2xRituals
Lotus Bloom 2xLands 4xRituals OR 3xDesperate Rituals
Goblin Electromancer 2xLands 3xRituals OR 2xDesperate Rituals
Goblin Electromancer 1xLand 4xRituals OR 3xDesperate Rituals
Lotus Bloom AND Goblin Electromancer 3xLand 1xRitual
Lotus Bloom AND Goblin Electromancer 2xland 2xrituals