327 cards found matching energy cost is at least 4

Adaptatron
Akshan
Albus Ferros
Alpha Wildclaw
Ambessa
Ancient Warmonger
Angler Beast
Anivia
Annie
Aphelios
Applied Researchers
Arachnoid Horror
Arena Kingpin
Arise!
Armed Assailant
Ashe
Assembly Rig
Astral Heron
Atakhan
Aurok General
Ava Achiever
Azir
Baccai Sandspinner
Baccai Witherclaw