Talk:Items/@comment-24915410-20180711011245/@comment-26684750-20180711035957

It can nullify items. As said by Crayons:

"You can still nullify the use of the card."

Future just never directly answered your question.

You can only nullify "use" (meaning call/equip/cast) of a card with Shining Jack, and not effects like [Act]. See here for the rulings.