207 cards found matching energy cost is at least 5

Stormbringer
Stormclaw Ursine
Swain
Syndra
Targonian Visionary
Tasty Faefolk
The Harrowing
Thermo Beam
The Ruination
Thousand-Tailed Watcher
Tianna Crownguard
Tibbers
Time Warp
Towering Pairofant
Trove Golem
Tryndamere
Udyr
Ultrasoft Poro
Unchecked Power
Undercover Agent
Undertitan
Vanguard Armory
Vanguard Attendant
Vex