Contract of Chaos

When Contract of Light enters the battlefield, you sign this Contract
{r}: Target player signs this Contract
{2}: You sign this Contract. Any player may activate this ability. Activate this ability only as a Sorcery
Whenever a player who has signed this Contract draws a card, they may instead exile a number of cards from the top of their library equal
to the number of Players who have signed this contract. Until the end of turn, that player may play cards exiled this way