I played Solidarity at a local 4-rounder yesterday going 3-1.
0-2 Miracles: Not sure how to win a late counter war.
2-0 UR Delver: His hands developed poorly and I was lucky having some decent draws.
2-1 Grixis Delver: Instants are better than creatures and my Flusterstorms countered the relevant spells.
2-0 UGW FoodChain: Nothing special to tell. He was quite lucky in g1 drawing all the FoWs but I managed to punch through his permission spells.
Deck felt strong, especially the addition of Mystic Sanctuary paid off.

1 Turnabout
2 Impulse
2 Veil of Summer
3 Meditate
3 Flusterstorm
3 Force of Will
3 Cunning Wish
4 Reset
4 Mission Briefing
4 Accumulated Knowledge
4 Brainstorm
4 High Tide
4 Opt
2 Mystic Sanctuary
2 Tropical Island
7 Island
2 Scalding Tarn
2 Misty Rainforest
2 Flooded Strand
2 Polluted Delta

I had like ten minutes time to throw together a sideboard that's why it looks rather random. I am pretty satisfied with the main though.

2 Brain Freeze
1 Blue Sun's Zenith
2 Veil of Summer
1 Krosan Grip
2 Echoing Truth
1 Spell Pierce
2 Divert
1 Jace, Wielder of Mysteries
1 Turnabout
1 Meditate
1 Force of Will