However, if I wish it, I will never lose to Uba Stax with any Drain deck.
If I had to trim down Smmenen's long response to one sentence, this would be it. It is a point that I have been essentially making in a few other threads. Gifts can easily reconfigure itself to have an amazing UbaStax match-up at little cost; I elect not to do so with my current build simply because I don't face many UbaStax decks in my local meta. However, if the numbers go up, I'll make the appropriate modifications to maintain my edge.
This is also the reason that I will likely never pilot UbaStax in any major event - I view UbaStax more as an obstacle/speed bump rather than a consistent tourney winner.