373 cards found matching energy cost is at least 4

Ava Achiever
Azir, Ascendant
Azir, Sovereign
Baccai Sandspinner
Baccai Witherclaw
Bandle Soldier
Bard, Mercurial
Baron Nashor
Battering Ram
Beast Below
B.F. Sword
Bilgewater Bully
Blade Twirler
Blast Cone
Blast of Power
Blazing Scorcher
Blighted Battleaxe
Blind Fury
Blitzcrank, Impassive
Blue Sentinel
Bottled Constellation
Brazen Buccaneer
Breakneck Mech
Brynhir Thundersong