There is a Retraction Helix combo that really does fire on turn 2, but you have to be on the draw.
Turn 1: draw (8), Island (7),
Ornithopter (6), tap Island for
Springleaf Drum (5), tap Ornithopter and Springleaf Drum for mana to play another Springleaf Drum (4), play another Ornithopter (3), and tap the second pair to play
Elvish Mystic (2).
Turn 2: draw (3), Plains (2), tap both lands, an Ornithopter, and a Drum for
Jeskai Ascendancy (1).
Tap the other Ornithopter-Drum pair for U, and tap Elvish Mystic to float G, then play
Retraction Helix (0) targeting one of the Ornithopters. Ascendancy triggers, all your creatures get +1/+1 and they all untap. You can draw and discard if you like, but since you have no cards in hand, you're just forced to discard the same card.
Whichever Ornithopter received the Retraction Helix ability, call it A. Tap Ornithopter A to bounce one of the Springleaf Drums, then use your floating G to replay it. Jeskai Ascendancy triggers, and you can respond by tapping Elvish Mystic (which will untap anyway) for another G.
This now becomes a straightforward loop: Ornithopter A taps to bounce a Drum, Ornithopter B taps along with the Drum to produce a mana of any color which you can stockpile up, and Elvish Mystic taps for a G which you use to replay the Springleaf Drum after bouncing it. So you end up needing one mana of any color for each time through the loop, and all three creatures get +1/+1 each time through as well, which is less relevant.
Note that "+1/+1 and untap" is a separate trigger from "draw and discard", and the latter is optional in any event, so you can keep this going to get as much mana as you want, not limited by cards in library.
So what good does it do to have unlimited mana if there are no cards in hand to spend it on? Well, by using the loot trigger to effectively flip your library into the graveyard, you can use the graveyard ability from
Soul of Innistrad. It will return any other three creature cards you like, possibly including another Soul of Innistrad, at which point you can make use of the repeatable battlefield ability to bring back all the rest of your creature cards.
Another card you can bring back is
Warden of the Eye, to get back any of your noncreature cards. If the card you bring back is
Twinflame, it's easy to get a loop going that returns all your other cards.
In any case, winning from this position shouldn't be too hard.