Cloud Key [Future Sight] SWSH091 Set: Commander 2017 Type: Instant

Set: Commander 2017 Type: Instant Rarity: Mythic Cost: {X}{R}{R} Multikicker {1} (You may pay an additional {1} any number of times as you cast this spell

create three 1/1 white Cat creature tokens with lifelink

Set: Beta Edition Type: Sorcery Rarity: Uncommon Cost: {2}{G} Destroy target land

But where is the source

Cloud Key [Future Sight] SWSH091 Set: Commander 2017 Type: InstantSet: Future Sight Type: Artifact Rarity: Rare Cost: {3} As Cloud Key enters the battlefield, choose artifact, creature, enchantment, instant, or sorcery. Spells you cast of the chosen type cost {1} less to cast. The musical sound of its turning triggers the tumblers of revelation.