304 cards found matching energy cost is at least 4

Mystic Reversal
Navori Scout
Needlessly Large Yordle
Nocturne, Horrifying
Noxian Guillotine
Noxus Hopeful
Ornn, Blacksmith
Ornn, Forge God
Overt Operation
Peak Guardian
Perched Grimwyrm
Petty Officer
Playful Phantom
Poppy, Defender of the Meek
Poppy, Paragon
Possession
Primal Strength
Prize of Progress
Production Surge
Progress Day
Promising Future
Qiyana, Victorious
Rabadon's Deathcrown
Raging Firebrand