142 cards found matching energy cost is 3

Ahri, Inquisitive
Allay, Eager Admirer
Alpha Strike
Arcane Shift
Arena Bar
Aspiring Engineer
Back Off
Back to Back
Baited Hook
Bewitching Spirit
Black Market Broker
Black Rose Dignitary
Blade of the Ruined King
Boneshiver
Boots of Swiftness
Bubble Bot
Buhru Captain
Caitlyn, Patrolling
Call to Battle
Call to Glory
Card Sharp
Cemetery Attendant
Chakram Dancer
Corrupt Enforcer