With regards to Volrath’s Curse and other similar old cards, when exactly can I sacrifice a permanent to ignore the effect? Can this be used as just a free repeatable sacrifice engine?
Paying to ignore these effects is a type of special action. This means that you have to have priority to make the payment, but doing so doesn't use the stack.
Since these effects are ongoing, the ability to pay them doesn't go away and so you can use Volrath's Curse as a free sacrifice outlet if you really want to.











