Outlaws of Thunder Junction Commander

Instant

Undaunted (This spell costs {1} less to cast for each opponent.)
Destroy two target creatures.

Curtains' Call

Commander Masters

Sorcery

Undaunted (This spell costs {1} less to cast for each opponent.)
Destroy all creatures.

Sublime Exhalation

Undaunted (This spell costs {1} less to cast for each opponent.)
Exile two target creatures. For each of those creatures, its controller reveals cards from the top of their library until they reveal a creature card, puts that card onto the battlefield, then shuffles the rest into their library.

Divergent Transformations

Tales of Middle-earth Commander

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.

Seeds of Renewal

Commander 2016

Undaunted (This spell costs {1} less to cast for each opponent.)
Return all nonland permanents to their owners' hands.