Cavern of Origins

{1}, {t}: Choose one —
• Add {c}{c}.
• Reveal the top card of your library until you
reveal a creature card. The next spell you cast
this turn that shares a creature type with the
last card revealed this way costs up to {2} less
to cast and you may cast it as though it had
flash. Then put all cards revealed this way on
the bottom of your library in any order.