I Notice a Lot of Changes Here

Just a second, shut up! When you cast this spell,
allow target opponent to memorize the board
state for up to 60 seconds.
That same player must leave the room. Only you
are allowed to make 3 changes to the board state
while they are outside of the room. Once you
declare you are finished, they may eneter. If they
guess what 3 things you changed using up to five
guesses, they gain 10 life and draw 2 cards. Otherwise, they lose 10 life and discard 2 cards.
(Revert the changes after this spell re