Leda, Sivertongued Sister

Hexproof
{b}{b}, {t}: Choose a player. That player may pay 3
life. If they do, you create a treasure token and
gain 2 life. If they don't, you may search their
library for a card and exile it face down. For as
long as that card remains exiled, you may look at
it, you may cast it, and you may spend mana as
though it were mana of any colour to cast it.
"Brother, what is it you desire?"