304 cards found matching energy cost is at least 4

Scrutinizing Sergeant
Sett, Brawler
Sett, Kingpin
Shadow Watcher
Shard of Undoing
Shurelya's Requiem
Simian Ancestor
Singularity
Sivir, Ambitious
Sivir, Mercenary
Sky Splitter
Solari Chief
Sona, Harmonious
Soraka, Wanderer
Soulgorger
Soul Shepherd
Spectral Centaur
Spectral Matron
Spoils of War
Sprite Burst
Sprite Mother
Sprite Queen
Square Up
Stalking Wolf