Is uba still viable? I've won several magic-league tournies with it but i'm not sure if thats good enough.

I've been running one variant of stax or another for a while and that uba mask provides has been superb. The sideboard needs some work, but i really have no idea what i'm going to see at the next tournament. This deck handles a lot of the random jank that i see with ease and absolutely wrecks poor mana bases. This deck has a fairly good game versus GAT which is on the rise and doesn't really fold to most decks, even those with hate.

I've tested serum powders and they are just nuts, I'm currently using Meatberts deck in a magic-league tournament, results will follow.

the current list:
    4  Bazaar of Baghdad
    4  Mishra's Workshop
    4  Wasteland
    1  Strip Mine
    4  Barbarian Ring
    1  Tolarian Academy
    1  Mishra's Factory (3)
    1  Mishra's Factory (1)
    3  Mountain
    4  Goblin Welder
    1  Karn, Silver Golem
    1  Black Lotus
    1  Mox Ruby
    1  Mox Jet
    1  Mox Sapphire
    1  Mox Emerald
    1  Mox Pearl
    1  Sol Ring
    4  Serum Powder
    4  Smokestack
    4  Uba Mask
    4  Crucible of Worlds
    4  Sphere of Resistance
    4  Chalice of the Void
    1  Trinisphere
SB: 4  Leyline of the Void
SB: 4  Pithing Needle
SB: 4  Powder Keg
SB: 3  Jester's Cap