The planeswalker Nahiri doesnt count as a Kor creature for the purposes of gameplay, but she does hail from the Zendikari Kor flavor-wise
Even the Sieges that dont have planeswalkers on the back seem to be worth casting on the front, and worth defeating to unlock the back
The second level of the class allows you to play the top cards of the library as long as you have cast a spell this turn
Now here's the problem: Take Egotist out of Scourge and let it live a life surrounded by cards from other sets
Aberrant Mind Sorcerer Abhorrent Oculus Acolyte of Affliction Adwal, Breaker of Chains Airlift Chaplain Animal Magnetism Arid Archway Ashiok, Sculptor of Fears Astrid Peth Avenging Druid Barrier of Bones Bashful Beastie Biblioplex Assistant Bison Whistle Blanchwood Prowler Bloodwater Entity Bookwurm Boseiju Reaches Skyward Brazen Buccaneers Break Down the Door Breaking // Entering Calix, Destiny's Hand Call of the Wild Cauldron's Gift Cavalier of Thorns Cemetery Tampering Cenote Scout Champion of Stray Souls Charforger Chrome Courier Circle of the Land Druid Clandestine Meddler Clone Shell Commercial District Conductive Machete Conduit Pylons Corpse Appraiser Curator Beastie Curse of Unbinding Cursed Windbreaker Dakmor Salvage Deadbridge Chant Deeproot Wayfinder Defiant Survivor Defossilize Dire Fleet Interloper Disturbing Mirth Dogged Detective Draugr Thought-Thief Dread Summons Dreadhound Dukhara Scavenger Earth's Mightiest Heroes Eccentric Farmer Eerie Soultender Elegant Parlor Emissary of Sunrise Emry, Lurker of the Loch Enduring Renewal Enigma Sphinx Extract from Darkness Extractor Demon Faerie Dreamthief Fallaji Archaeologist Fated Return Fleeting Memories Foul Watcher Gallifrey Council Chamber Gamekeeper Garland, Knight of Cornelia Gate Colossus
Nope, you cannot regenerate a creature that is exiled because the creature was not destroyed
