304 cards found matching energy cost is at least 4

Gearhead
Gentle Gemdragon
Gentlemen's Duel
Glasc Mixologist
Grand Strategem
Guardian of the Passage
Gutter Palace
Harnessed Dragon
Harpoon Squad
Herald of Scales
Herald of Spring
Highlander
Hostile Takeover
Hwei, Brooding Painter
Iascylla
Icathian Rain
Imperial Decree
Imposing Challenger
Inviolus Vox
Irelia, Fervent
Irelia, Graceful
Ivern, Friend to All
Ivern, Nurturer
Jae Medarda