The alternate name has no effect on gameplay. If you put Thrum of the Vestige in your Commander deck, you're in fact putting in a Lightning Bolt as far as singleton deckbuilding rules go
Aegar, the Freezing Flame Axelrod Gunnarson Bartel Runeaxe Beluna Grandsquall Bonny Pall, Clearcutter Bre of Clan Stoutarm Brion Stoutarm Dargo, the Shipwrecker Gorm the Great Jareth, Leonine Titan Kalemne, Disciple of Iroas Kroxa and Kunoros Kroxa, Titan of Death's Hunger Oloro, Ageless Ascetic Osgir, the Reconstructor Phlage, Titan of Fire's Fury Rosheen Meanderer Rosheen, Roaring Prophet Ruhan of the Fomori Storvald, Frost Giant Jarl Surtr, Fiery Jtun The Lady of the Mountain Thryx, the Sudden Storm Uro, Titan of Nature's Wrath Vogar, Necropolis Tyrant Yorvo, Lord of Garenbrig Zalto, Fire Giant Duke
You can pick: Create a Treasure Token and lose one life
You may cast the exiled card without paying its mana cost if its an instant spell with mana value 2 or less
The worst part is that it discards the top card of your deck
This card has a lot to say, and without an article, it would be impossible to say it all