142 cards found matching energy cost is 3

Crackshot Corsair
Crescent Strike
Crimson Pigeons
Crowd Favorite
Dangerous Duo
Diana, Lunari
Disarming Rake
Eager Apprentice
Eager Drakehound
Eclipse
Edge of Night
Energy Conduit
Enthusiastic Promoter
Evershade Stalker
Ezreal, Prodigy
Faithful Manufactor
Find Your Center
Fiora, Peerless
Fiora, Worthy
First Mate
Fizz, Trickster
Flame Chompers
Fox-Fire
Frostcoat Cub