373 cards found matching energy cost is at least 4

Ember Monk
Eminent Benefactor
Endless Riches
Esteemed Hierophant
Ezreal, Dashing
Fading Memories
Fae Dragon
Fae Porter
Falling Comet
Fate Weaver
Ferrous Forerunner
Field Musicians
Final Spark
Fiora, Victorious
Firestorm
Flurry of Feathers
Forgefire Cape
Forgotten Relic
Fretful Feline
Frisky Hunter
Gangplank, Naval
Garen, Commander
Garen, Rugged
Gearhead