169 cards found matching energy cost is 3

Acceleration Gate
Affectionate Poro
Ahri
Akali
Allay, Eager Admirer
Alpha Strike
Apprentice Mage
Arcane Shift
Arena Bar
Aspiring Engineer
Baccai Reaper
Back Off
Back to Back
Baited Hook
Bewitching Spirit
Black Market Broker
Black Rose Dignitary
Blade of the Ruined King
Boneshiver
Boots of Swiftness
Brutal Hunter
Bubble Bot
Buhru Captain
Caitlyn