373 cards found matching energy cost is at least 4

Sacred Protector
Safety Inspector
Sai Scout
Sandshifter
Sandstone Chimera
Scrapyard Champion
Scrutinizing Sergeant
Sett, Brawler
Sett, Kingpin
Shadow Assassin
Shadowblade Lurker
Shadow Watcher
Shady Spectacles
Shard of Undoing
Shen, Leader of the Kinkou Order
Shen, Scourge of Shadows
Shurelya's Requiem
Simian Ancestor
Singularity
Siphoning Strike
Sivir, Ambitious
Sivir, Mercenary
Sky Cruiser
Sky Splitter