Tasha's Caustic Brew

Xerox
Put X -1/-1 counters on each creature players
control. X is equal to the number of cards in
exile with Page counters on them. If X if 5 or
more, each player instead sacrifices that many
creatures and you remove that many Page
counters from cards in exile. If X is 0, then
exile all non-token creatures.
"I'll brew something awful for you next time!" ~Tasha