The -3/-3 from Locthwain Scorn is enough to take down most of the one, two, and three mana creatures in the format
As its only 1/1, it becomes better the more +1/+1 Counters, Equipment or Enchantment Auras you attach which is something Green isnt short of offering
You can still activate Kaito's loyalty abilities

Arjun, the Shifting Flame Bria, Riptide Rogue Brudiclad, Telchor Engineer Dack Fayden Epic Experiment Eris, Roar of the Storm Expressive Iteration Fevered Visions Firkraag, Cunning Instigator Galazeth Prismari Iron Man, Titan of Innovation Jhoira of the Ghitu Jhoira, Weatherlight Captain Keranos, God of Storms Kraum, Ludevic's Opus Kylox's Voltstrider Ludevic, Necro-Alchemist Magma Opus Melek, Reforged Researcher Mizzix of the Izmagnus Muddle, the Ever-Changing Myra the Magnificent Niv-Mizzet, Dracogenius Niv-Mizzet, Visionary Niv-Mizzet, the Firemind North Wind Avatar Prismari, the Inspiration Ral Zarek Ral, Caller of Storms Ral, Crackling Wit Ral, Izzet Viceroy Ral, Leyline Prodigy Rielle, the Everwise Rootha, Mastering the Moment Saheeli Rai Saheeli, Filigree Master Saheeli, the Gifted Saheeli, the Sun's Brilliance Sarkhan, Soul Aflame Stella Lee, Wild Card Tawnos, Urza's Apprentice The Invincible Iron Man The Locust God The Royal Scions The Tenth Doctor Thousand-Year Storm Veyran, Voice of Duality Vivi Ornitier Zaffai, Thunder Conductor
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It was pretty good in the draft format