Mojourn,Hollow Truthseeker

Skulk
Whenever Mojourn deals combat damage to a player, that player exiles the top eight cards of their library
you may cast those cards and spend mana as though it were any type to cast them as long as they remain exiled
Any player may pay {p/u}{p/u}{p/b}{p/b}{p/g}{p/g} to counter this effect