I found early max Vir to be a viable opening in Purple, and I think it can stand-up in tournament play given the right conditions. I played mono-Purple in RACE #3, and used max Vir both with ultimate and without (and also teching it but never getting chance to play it) All were against strong opponents, so I think Vir can definitely stand up to tournament play.
However, there are a lot of situations where it doesn’t work. Black has Sac the Weak and Executioner, Blue has Manufactured Truth and Quince. Red can tech Chaos Mirror which makes it easier to deal with your Mech, and Green can similarly tech Tiny Basilisk. Purple can tech their own Seers to delay your Double Time or Mech, if you don’t manage to get it to arrive the turn you max Vir.
Where it does work though, it’s pretty good. I tech Seers much earlier than you though. If you double tech Seer on turn 2, you have a very good chance of being able to bring the Mech in on turn 3. (Typically you’re drawing 5 cards from an 8 card deck, and you need to hit 2 of your 3 time rune manipulation cards. Vir’s midband gives you an extra chance if he doesn’t have arrival fatigue, and if you can get a tech draw you guarantee it). A 6/7, a 3/5 and 1 or 2 2/1s on turn 3 is a pretty strong tempo play, and as you can see from some of the games I played, your opponent finds it tough to come back.
Double Time I feel is fairly costed. If you can get it to resolve, future has solid tech II options (read: Omegacron) to mean that you can probably either finish the game, or maybe even push another Double Time through. It’s definitely a high risk play though.