Cheapest priced copy (Tales of Middle-earth Commander): $0.49 at Card Kingdom, near mint, their price list as of .
Seeds of Renewal 
Sorcery · Rare · Commander 2016 · #24
Undaunted (This spell costs {1} less to cast for each opponent.)
Return up to two target cards from your graveyard to your hand. Exile Seeds of Renewal.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.49 to $0.59 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2016 | 24 | Rare | $0.59 | — |
| Tales of Middle-earth Commander | 260 | Rare | $0.49 | — |
4 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 2016If each target is illegal as Seeds of Renewal resolves, Seeds of Renewal doesn't resolve and is put into its owner's graveyard. It's not exiled.
- 8 November 2016Effects that reduce what you pay to cast a spell don't affect its mana value.
- 8 November 2016If one target becomes illegal before Seeds of Renewal resolves, you'll still return the legal target from your graveyard to your hand.