It is easier to cast, generally has a more potent removal effect, can scale up in power, and has that valuable lifegain option
Since all your token copies will also have myriad, you'll quickly have an overwhelming army of The Masters ready to take over the world
For reference, this cards original printing was in the Strixhaven Commander deck for Osgir, the Reconstructor, who can make multiple copies of this that can be sacrificed when necessary for a brand new hand of seven cards
Unfortunately you lose all of your progress if Hallar dies or otherwise leaves play, and that fact that you want to kick all of your spells plays merry havoc with the mana curve of any deck that has Hallar at the helm
Fill out your own regional Pokdex starting with first partners Snivy, Tepig, and Oshawott as foil promo cards, then find more Unova Pokmon inside four booster packs (two from each expansion) from the special Scarlet & VioletBlack Bolt and Scarlet & VioletWhite Flare expansions
Conduit of Emrakul Conduit of Storms Dronepack Kindred Erupting Dreadwolf Fibrous Entangler Howling Chorus Kessig Prowler Shrill Howler Sinuous Predator Smoldering Werewolf Tangleclaw Werewolf Ulrich of the Krallenhorde Ulrich, Uncontested Alpha Ulvenwald Abomination Ulvenwald Captive Vildin-Pack Outcast