Originally Posted by
Mr. Safety
It may have been Ponder, especially considering the lack of fetchlands. It didn't get much traction. Without fetchlands Brainstorm is definitely sub-par.
I think with Crucible of Worlds 4-drops, including Jace, are just fine in Pox. Nether Void, the Abyss, and Night of Soul's Betrayal all see play occasionally in Pox. Jace provides a win condition and all but eliminates your opponent top-decking out of your soft lock, which is a classic problem for Pox, or it can just feed you the best card in your top 3 every turn if you need gas. In theory it's incredible, but as you say in practice it wasn't performing. The mana rocks actually helped with stability slightly because Talismans don't get affected by Smallpox. I'm sure it would put up numbers if it was indeed good. There was nowhere near enough blue to enable Forces IIRC.