Grandma's Clock

Grants a card slot.

Play this card face down; at any point on an enemies
turn, after you are attacked, you may choose to reveal this
card, and undo that move. The opponent then loses their turn.

"The Log Clock is a unique clock that hangs on the wall in
the basement. It is made out of a piece of wood that looks
like it got rolled out with a rolling pin.
Unfortunately, this clock (like many clocks in Grandma’s house) never shows the correct time."