Two decklists have emerged as contenders:
Choice 1: Monastery Swiftspear faster version
4x Delver of Secrets
4x Monastery Swiftspear
2x Young Pyromancer
2x Snapcaster Mage
4x Monastery Mentor
4x Gitaxian Probe
4x Lightning Bolt
3x Path to Exile
4x Serum Visions
4x Sleight of Hand
1x Vapor Snag
1x Repeal
4x Lightning Helix
1x Electrolyze
4x Scalding Tarn
4x Flooded Strand
3x Steam Vents
2x Hallowed fountain
1x Sacred Foundry
2x Island
1x Plains
1x Mountain
Sideboard:
3x Pithing Needle
3x Relic of Progenitus
2x Dispel
2x Negate
2x Counterflux
2x Stony Silence
1x Wear / Tear
Version 2: Young Pyromancer + more control
4x Delver of Secrets
4x Young Pyromancer
2x Snapcaster Mage
4x Monastery Mentor
4x Gitaxian Probe
4x Lightning Bolt
3x Path to Exile
4x Serum Visions
4x Sleight of Hand
1x Vapor Snag
1x Repeal
3x Lightning Helix
2x Electrolyze
2x Dispel
4x Scalding Tarn
4x Flooded Strand
3x Steam Vents
2x Hallowed fountain
1x Sacred Foundry
2x Island
1x Plains
1x Mountain
Sideboard (not refined):
1x Rest for the Weary
1x Lightning Helix
3x Relic of Progenitus
2x Negate
2x Counterflux
3x Stony Silence
2x Wear / Tear
1x Dispel