Basically, while the actual milling effect of Compelling Argument isn't good, it's a fine card thanks to the ability to turn it into a more useful card for just one mana, while also giving us some late-game upside of milling our opponent when they are almost out of cards
Not particularly, but they are certainly worth mentioning
At the beginning of each opponent's upkeep, Mogis deals 2 damage to that player unless they sacrifices a creature
Andril, Flame of the West Aragorn and Arwen, Wed Aragorn, the Uniter Arwen, Mortal Queen Dawn of a New Age Gandalf the White Glamdring Hew the Entwood Last March of the Ents Mount Doom Palantr of Orthanc Radagast the Brown Saruman of Many Colors Sauron, the Dark Lord Sauron, the Lidless Eye Shadow of the Enemy Spiteful Banditry Storm of Saruman The One Ring The Watcher in the Water Tom Bombadil Witch-king of Angmar
Ultima destroying all artifacts is the ultimate nonbo with this card, so unfortunately you can't play this amazing wrath effect if your deck also relies on Pinnacle Starcage
Developers tell Polygon that the characters and abilities in this special D23 Expo Collectors Set including Mickey Mouse will also appear in Disney Lorcana: The First Chapter