Yeah, if you'd countered the Jitte, I'd have been done for. Most of the cards in my hand are white and I STILL haven't seen a white mana source this game. I fully expected to lose after the manascrew persisted, but hadn't counted on even worse luck for you...
Untap, draw, tap a Mountain for Sol Ring, attack with the Pony and remove three counters from Jitte to pump the Pony for +6/+6. If you have no responses, I'm done.
Oversoul
Life: 20
Cards in Hand: 6
Cards in Library: 44
In Play:
-(U, U, T) Mountain x3
-(U)
Shivan Gorge
-(2 counters, equipped to Dwarven Pony)
Umezawa's Jitte
-(1/1, T)
Dwarven Pony
-(U)
Sol Ring
Graveyard: Strip Mine, Lightning Bolt, Juggernaut
RFG:
BigBlue
Life: 14 (7?)
Cards in Hand: 3
Cards in Library: 44
In Play:
{UUUUUU}
Island x6
Tropical Island
Graveyard: Prodigal Sorcerer, Citanul Hierophants, Forest, Tradewind Rider, Birds of Paradise, Mana Leak
RFG: