Fair trade

When this enters the stack, you may
Pay {2} : target player show you 1 card for {x} where x is the amount you payed
Pay {4} : target player shows you 3 cards for {x} where x is the amount you payed
Pay {x}{8} : look at X players hand and they show you 3 cards for {x} where x is the amount you payed
(All of them let you trade and it’s the {x} you payed to cast.)