Cheapest priced copy (Commander Masters): $0.49 at Card Kingdom, near mint, their price list as of .
Sublime Exhalation 
Sorcery · Rare · Commander Masters · #60
Undaunted (This spell costs {1} less to cast for each opponent.)
Destroy all creatures.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
4 printings · $0.49 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2016 | 5 | Rare | $0.69 | — |
| Commander Anthology Volume II | 36 | Rare | $0.59 | — |
| Commander Masters | 60 | Rare | $0.49 | $0.79 |
| Commander Masters | 475 | Rare | — | — |
2 rulings from Wizards of the Coast
- 8 November 2016Causing 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.
- 8 November 2016Effects that reduce what you pay to cast a spell don't affect its mana value.