Plasmodium played on Turn 1 can usually show up in time to do good work. It's also worth accelerating with Seer / Time Spiral
Knight of the Conclave needs a very specific setup / conditions to be worthwhile, it's not worth it to just toss it in your deck and Forecast it on turn 3 or 4. Generally not worth accelerating
Vir's maxband is good value, and the Mech shows up in time to make a difference if you go for an early (T3 or 4) maxband. Especially good if accelerated.
Double Time will usually win you the game, if you can survive spending 6 gold on nothing. Worth accelerating.
Omegacron is usually accelerated out for a sudden lethal attack. Seer/Time Spiral is just redundant.
Reaver is generally too slow, even if accelerated out.