Solidarity doesn't bother my list at all. Æther Vial + True Believer + Mom(over Rule of Law, you can Call and Wish for them, and it's two targets to bounce in one turn), done.

I run black in my list as well (in case you just act like you read it), but only to activate Sanctum(you can get scrubland with windswept heath, duh), or cast the crypt angel i wished from the sideboard....condemn is so much better than worthy cause(just ask yourself this-how often do you really need to buyback?)-the beauty behind mannichi here(besides the fact you can search for him with your 8 creature tutors) is if they counter your condemn, you can still switch to a 1,000,000/x and win through the counter. i love it.

If you're honestly under the impression that True Believer + Mother of Runes can solve your problems against Solidarity, then you must be delusional. The deck puts almost no pressure on them, so they can sit back and wait for the perfect hand and bounce the True Believer in response to Mom's pro-blue trigger with a 2nd Cunning Wish, then deck you. The only pressure the build has is Mannichi, and that's hardly enough. Also remember they still run 8 counters, so they could just counter the Believer anyway. The only way creature-based decks win against Solidarity is by putting pressure on them. You need to put them on a clock while applying pressure. Know your role in this matchup. You're not playing the combo deck, you're playing the aggro deck.

As for Condemn, I'm not really sure. It's not the buyback that has me playing it, but the fact that it's not conditional. I need to be attacking for condemn, which means the creature that is to be sacrificed had to be played the turn before. So much for topdecking creatures if you can't win with them that turn. It's like adding Suspend 1-- W to Worthy Causes's textbox. Remember you are the combo deck and you're aiming to combo as fast as possible unconditionally. As good as Condemn is as removal as well, it shouldn't matter if you're trying to win.

Also, I was aware that your list had black, although I wouldn't actually consider it part of the deck, what with the sole black card being a wish target.