Does Void Rush account for repeat cost like a Blood Rush?

No, Void Rush does not account for or interact with Repeat costs.

Here is the breakdown of why:

1. Different Mechanics: Repeat (Rule 746) is an optional additional cost keyword found on spells that allows you to execute the spell's effect an additional time. Void Rush is a spell that allows you to play a card from your deck at a reduced cost.
2. Cost Determination: According to Rule 130.4, effects that determine a card's cost for any purpose always use its base cost. Additional costs, such as Repeat or Accelerate, are separate from the base cost and are not factored into cost-reduction effects (see also FAQ #18 regarding Yordle Explorer).
3. Void Rush's Effect: Void Rush reduces the cost of the card you play from your deck by [2]. This reduction applies to the base cost of that card. If the card you play from your deck happens to have the Repeat keyword, you would still have to pay the full, separate Repeat cost if you chose to use it, as that is an optional additional cost paid during the "Pay Costs" step (Rule 354.2).

In short, Void Rush only reduces the base cost of the card it plays; it does not cover, reduce, or interact with any additional costs like Repeat.