Can you accelerate tokens created by Rek'Sai (such as from Vanguard Captain), and what would the power cost be?

Ruling: Yes, you can accelerate tokens. The power cost for accelerating a token is 1 energy and 1 universal power (any domain).

Sequence:

• When you play a token, it will have accelerate
• Pay 1 energy and 1 universal power to have the token enter ready

Nuances:

• Tokens do not have domains
• When a unit has no domain or more than one domain, the power portion of the accelerate cost can be paid with universal power (any domain)