Flying, Arctic Veil, Sand Veil, Macadamize, Fire Immunity, Sandspout/Sand Spray, Thorn Collection, Ice Storm, Reclaim, Ooze/Water/Rock/whatever Generator, Avalanche, Forest Front, Ice Front, Lavawalker, Monsoon, Naturalize
In most cases it's not that hard to work around. I'm just glad that the UDers haven't figured out how well it pairs with breath of ash.
Was in a pretty icky situation. Enemy had a colossal unit (fire giant) and my 2X2 was melee, but his colossal unit was surrounded by lava at all times, so I could only engage him if I took 60 fire damage.