How can an apostate (intentional apostate) intend to do what the Church intends? That is a requirement for validity, along with proper form and proper matter. By very definition a Satanic intent would render it invalid.
I disagree. A validly ordained priest who has become a Satanist can most definitely have the right intention to do what the Church intends, consecrate the Eucharist. Even though he is consecrating the Eucharist for evil purposes, he still intends to consecrate the Eucharist. There is no point in desecrating or committing sacrilege against a piece of bread. In fact, some Satanists and Satanist priests know very well that transubstantiation is real more so than many other non Satanist Novus Ordo parish priests I know.