This, in and of itself, is not necessarily a problem
Garruk is clearly both green and black now, so that seemed to be a good choice
But a significant advantage for Solitude over Swords is that can be played with its evoke cost of exiling one other white card from your hand no mana needed
Izzet Prowess (140 players) : The deck lives up to its name, applying early pressure with Stormchaser's Talent and Cori-Steel Cutter, often flanked by Monastery Swiftspear and Drake Hatcher
The card still synergizes incredibly well with Dragons Rage Channeler and other Delirium cards, or Emry, Lurker of the Loch which has since made a re-appearance in Jeskai Breach and Esper Turns
Anzrag, the Quake Mole is the only recent card that comes to mind in that regard