Harth, Chosen Cultist

Extort
{t}, Pay {p/b}{p/b} any number of times: For each time
you paid {p/b}{p/b}, exile a card from the top of your
library face down, you may put any number of
them on top of your library in any order.
{t}, {p/b}{p/b}{p/u}{p/u}{p/w}{p/w}: You may
cast a spell exiled by Harth without paying it's
mana cost.