[Takket]

If I play a card not to use it's game text, but to pay a cost, (like I Hate You allows you to play Vulcan Nerve Pinch), as a cost.......

Can VNP still be nullified by Amanda Rogers? (I.e., you don't use VNP's game text, but does it still count as a played interrupt?)

Can Goddess of Empathy prevent by from playing VNP to pay a cost?

[Enabran]

The answer is in the Glossary:

Cards played as a cost:

Some actions require a specific card to be played as a cost in order to resolve. When this is the case, use only the game text of the action; ignore the game text of the card being played as a cost. Cards which are played as a cost may be responded to normally and if the card played as a cost is nullified, initiation of the original action fails, no other costs are paid and the action's performer may attempt to use the action again at their next opportunity.