Sublime Exhalation
Sorcery
Undaunted (This spell costs 
less to cast for each opponent.)
Destroy all creatures.
Exhale, and let the winds carry your soul for all eternity.
Lake Hurwitz
Commander Masters (CMM)
• #60Rulings
Causing an opponent to lose the game after you've announced that you're casting a spell with undaunted and determined its total cost won't cause you to have to pay more mana.
(wotc • 2016-11-08)
Effects that reduce what you pay to cast a spell don't affect its mana value.
(wotc • 2016-11-08)
Rulings
Causing an opponent to lose the game after you've announced that you're casting a spell with undaunted and determined its total cost won't cause you to have to pay more mana.
(wotc • 2016-11-08)
Effects that reduce what you pay to cast a spell don't affect its mana value.
(wotc • 2016-11-08)