Paper Shield states: "Response: cancel the effect of an event card just played that does not have a gold or influence cost."
If I were to play Confession ("Any phase: Kneel 3 influence or kneel a Holy-crest character to look at an opponent's hand. Then, discard 1 non-limited card from that hand"), by kneeling a Holy-crest character, can it be cancelled by Paper Shield?
I can see this going either way -
1) the actual cost I used to play the event was kneeling a character, so YES Paper Shield can cancel it.
2) In terms of cost, Confession can be initiated using 2 different costs in the "Do X to Y" format. Do kneel 3 influence -> look at hand. OR Do kneel a Holy-crest -> look at hand. Does the event still have an influence cost even if I don't use that method to pay for it? So NO Paper Shield cannot cancel it.