Red is good with REB in the side mostly. I've been trying out UWr Landstill as a thought experiment but it hasn't worked out better than UWb mostly because red doesn't improve the matchup that the deck is bad in, but red improves the matchup that the deck is good in, so I see it as a win-more change so didn't go with it.

Moss did post a wonderful contender to an Ultimate Walker list which plays green with Loam and Garruk. I think he posted it in the wrong thread lol. Life from the Loam justifies the use of Forbid even more with the green splash. Garruk is another mighty strong walker that, like Elspeth, protects himself.