Gush Flash

With the unrestriction of Regrowth the possibility for a Flash deck emerges that can also use Gush as draw engine.

Heres what I have got so far.

Land:
1 Island
2 Polluted Delta
2 Misty Rainforest
2 Scalding Tarn
1 Flooded Strand
3 Underground Sea
3 Tropical Island

Creatures:
4 Protean Hulk
1 Carrion Feeder
1 Body Snatcher
1 Mogg Fanatic
1 Body Double
1 Reveillark

Spells:

1 Merchant Scroll
4 Force of Will
1 Mystical Tutor
1 Mox Sapphire
1 Mox Jet
1 Mox Emerald
1 Ponder
1 Time Walk
1 Ancestral Recall
1 Brainstorm
1 Black Lotus
4 Gush
1 Fastbond
1 Flash
4 Regrowth
4 Summoner's Pact
4 Pact of Negation
1 Vampiric Tutor
1 Demonic Tutor
1 Yawgmoth's Will
1 Misdirection
1 Mana Crypt
1 Echoing Truth

Sideboard:

1 Hurkyl's Recall
4 Snapcaster Mage
4 Leyline of the Void
4 Nature's Claim
1 Steel Sabotage
1 Annul

So now comes the questions, or question.

Why should I play Flash? Regrowth allows for a redundancy factor and when combined with Gush turns Flash into a darkhorse for Vintage.

Should the Mana Crypt be a Lotus Petal? (Or do I even need them at all?) Lotus Petal functions better under Yawgmoth's Will but Mana Crypt allows the Flash player to Regrowth a Flash back and recast the Flash spell.

61 cards maindeck. What should be cut for Echoing Truth, or more importantly should maindeck bounce be considered for this style of deck? Since decks like Dredge and Dark Times exist I think Echoing Truth is a must. Especially if players start loading up on more graveyard hate because of Regrowth decks. Dredge can and Dark Times usually does have maindeck Leyline of the Void. If we do not bounce Leyline we lose Game 1. Misdirection, and Body Snatcher are looking like fine cuts.

Is Yawgmoth's Will needed? I would normally say no, but with the pairing of Gush and Regrowth this could work out just fine.

Is the Reveillark Combo fast enough? I know that Wizards printed The Mimeoplasm so I know that combo exist but I'am not quite sure if it's better or takes less slots than the Reveillark Combo. I could cut Body Snatcher, but then the next problem arises when talking specifically about Flash decks.

How do I put cards back from my hand when I don't have 4 Brainstorm? Body Snatcher let's you play around this problem much like Legacy Cephalid Breakfeast decks used Cabal Therapy on themselves to get rid of the combo cards in their hand.

Games 2 and 3 your Nature's Claim on your own artifacts will allow you to continue to use the Gush Bond engine with Snapcaster. Thalia is hard for this deck to stop since the hate cards in the sideboard ( Claim, Annul, Steel Sabotage, Hurkyl's Recall) are all directed at artifacts and enchantments. Annul is because of Oath of Druid decks that prey on the Snapcaster Mage plan.

A good question to consider when trying Gush Flash is how many Summoner's Pact you want to run. That number helps determine the pace you are trying to Flash out at. Preordain could be a alternative to Summoner's Pact. Likewise in a old Flash thread Elvish Spirit Guide was mentioned as basically another Mox for when you use Summoner's Pact.