Demoniacal Spellwork

Each player sacrifices a nonland permanent.
Then you choose one or both—
•Spells cast this turn cost {x} less to cast, where X is the combined mana value of permanents they
sacrificed this turn.
•Spells cast this turn cost "Pay X life" more to
cast, where X is the combined mana value of
permanents they sacrificed this turn.
To revere success, you must first embrace pain.