Extorted Summoning

(You may cast a legendary sorcery only if you control
a legendary creature or planeswalker.)
Each player reveals the top card of his or her
library until he or she reveals an instant or sorcery
card, then repeats this process for a nonland
permanent. Each player may then cast either of
the two spells without paying their mana costs.
Exile all other cards revealed this way. You may
cast those cards as long as they remain exiled.