Sigarda's Vanguard (Extended Art) [Innistrad: Midnight Hunt Commander] Magic Premiere Shop 2009 You may cast it without

You may cast it without paying its mana cost if it's an instant or sorcery spell

Set: Seventh Edition Type: Enchantment Rarity: Rare Cost: {1}{B}{B} Whenever a player casts a spell

Set: Commander 2011 Type: Sorcery Rarity: Uncommon Cost: {2}{R/G} Firespout deals 3 damage to each creature without flying if {R} was spent to cast this spell and 3 damage to each creature with flying if {G} was spent to cast this spell

Set: Commander 2021 Type: Creature — Human Wizard Rarity: Rare Cost: {1}{R}{R} Flash

Some of the Cosmic Gambits have two abilities

Sigarda's Vanguard (Extended Art) [Innistrad: Midnight Hunt Commander] Magic Premiere Shop 2009 You may cast it withoutSet: Innistrad: Midnight Hunt Commander Type: Creature Angel Rarity: Rare Cost: {4}{W} Flash Flying Whenever Sigarda's Vanguard enters the battlefield or attacks, choose any number of creatures with different powers. Those creatures gain double strike until end of turn.