The strongest cancellation card in the game.
It cancels the entire card, ALL CARD TYPES, and discards it wholesale unlike A Test of Will which only cancels the When Revealed effect and can't cancel keywords like surge (not to mention Locations or Enemies being added to the staging area).
The only issue here is you have to build a deck around this card using additional cards like Out of the Wild, Leave No Trace, and None Return unlike A Test of Will.