If you are lucky you could also get wildcards in a pack and with that finish faster building out your decks
Honestly, though, Lathnu Hellion is fine to play even without a single other way to get Energy

Aang, the Last Airbender Abigale, Eloquent First-Year Aclazotz, Deepest Betrayal Adelbert Steiner Aerith Gainsborough Alchemist's Assistant Apocalypse Runner Archenemy's Charm Archon's Glory Ardyn, the Usurper Aurelia's Vindicator Baron Bertram Graywater Barrow Naughty Basilisk Collar Basri, Tomorrow's Champion Bishop's Soldier Brave Brawler Bre of Clan Stoutarm Brightblade Stoat Captain Marvel, Earth's Protector Case of the Gorgon's Kiss Cat-Gator Cecil, Redeemed Paladin Circle of Power Cloak and Dagger, Entwined Comet Crawler Congregation Gryff Cosmic Spider-Man Crossway Troublemakers Cult Healer Cursed Courtier Dashing Bloodsucker Dawnstrike Vanguard Deep-Cavern Bat Desperate Bloodseeker Dissection Tools Dragonbroods' Relic Drogskol Reaver Dust Animus Echo of Dusk Egrix the Bile Bulwark Eirdu, Carrier of Dawn Elegy Acolyte Elenda, Saint of Dusk Enduring Innocence Enter the Avatar State Eriette, the Beguiler Exalted Sunborn Ezrim, Agency Chief Fear of Infinity Felidar Savior Fell Gravship Foggy Swamp Hunters Foggy Swamp Spirit Keeper Foot Mystic Galian Beast Gargantuan Leech Garnet, Princess of Alexandria Generous Betty Wray Give In to Violence Gloryheath Lynx Grasping Shadows Guarded Heir Gumdrop Poisoner Gwenom, Remorseless Hardened Academic Healer's Hawk Heartflame Duelist Hope Estheim Inkshape Demonstrator Invisible Woman, Sue Storm Isilu, Carrier of Twilight

Worst of all, it shreds his pristine couture
Is Throne of Eldraine Card legal to play