Here's my current UWR version, if anyone cares:

4 Snapcaster Mage
3 Stoneforge Mystic
2 Vendilion Clique
1 Geist

4 Brainstorm
4 Swords to Plowshares
2 Lightning Bolt
1 Path to Exile
4 Force of Will
3 Spell Snare
2 Counterspell

1 Engineered Explosives
1 Batterskull
1 Sword of Fire and Ice

4 Jace, the Mindsculptor
1 Elspeth, Knight's Errant
(38)

4 Flooded Strand
4 Scalding Tarn
1 Arid Mesa
3 Tundra
2 Volcanic Island
1 Karakas
1 Plains
1 Mountain
3 Island
3 Wasteland
(23)

SB:
4 Surgical Extraction
2 Pyroblast
1 Red Elemental Blast
2 Disenchant
2 Wrath of God
1 Path to Exile
3 meta slots
-

Please let me know what you think are the most debatable choices and why.