Kellan, the Fae-Blooded [Wilds of Eldraine Prerelease Promos] Uprising Dromai Blitz Deck and it has this ability

and it has this ability

Set: Sun & Moon: Shining Legends Type: Psychic Rarity: Ultra Rare Retreat cost: 0

Each creature you tap while casting this spell pays for {1} or one mana of that creature's color

Set: Black & White: Black Star Promos Type: Psychic Rarity: Black Star Promo Retreat cost: Colorless

Set: World Championships 2015 Type: Colorless Rarity: Ultra Rare Retreat cost: Colorless

Kellan, the Fae-Blooded [Wilds of Eldraine Prerelease Promos] Uprising Dromai Blitz Deck and it has this abilitySet: Wilds of Eldraine Prerelease Promos Type: Legendary Creature Faerie Rarity: Mythic Cost: {2}{R} Double strike Other creatures you control get +1 +0 for each Aura and Equipment attached to Kellan, the Fae Blooded. Birthright Boon 1W Sorcery Adventure Search your library for an Aura or Equipment card, reveal it, put it into your hand, then shuffle.