169 cards found matching energy cost is 3

Ezreal
Faithful Manufactor
Find Your Center
First Mate
Fizz
Flame Chompers
Fox-Fire
Frostcoat Cub
Frostcoat Mother
Galio
Gemcraft Seer
Grim Apothecary
Guards!
Gustwalker
Heart of Dark Ice
Heimerdinger
Heroic Charge
Hextech Anomaly
Hextech Gauntlets
Hunter's Machete
Immortal Phoenix
Insightful Investigator
Invert Timelines
Iron Ballista