373 cards found matching energy cost is at least 4

Taric, Protector
Tasty Faefolk
The Harrowing
Thermo Beam
The Ruination
Thousand-Tailed Watcher
Tianna Crownguard
Tibbers
Time Warp
Tomb-Raider Barbara
Tools of Empire
Towering Combatant
Towering Pairofant
Tricksy Tentacles
Trinity Force
Trove Golem
Tryndamere, Barbarian
Twisted Fate, Gambler
Udyr, Wildman
Ultrasoft Poro
Unchecked Power
Undercover Agent
Undertitan
Vanguard Armory