That said, considering it has to be against a creature and not simply target, means you wont be getting the benefit from hitting players themselves, or opponents can simply choose not to block with one of their creatures and that means no counters, but with spells like Duel for Dominance or Ents Fury that forces Wolverine to attack an opponents creature or enchantments like Fire Whip can mitigate this restriction pretty easily
However, the difference lies in their keywords
The main reason being if you actually want a discard outlet Jace might only provide one once
From the moment you lay eyes on its presentation, the commitment to premium quality is undeniable

Act of Heroism Aim High Assquatch Basil, Cabaretti Loudmouth Beacon Hawk Bounding Krasis Bringer of the Red Dawn Chain Stasis Chakram Retriever Civic Gardener Companion of the Trials Dauntless Aven Disciple of the Ring Djeru's Resolve Elite Interceptor Fear of Missing Out Flash Conscription Flash Thompson, Spider-Fan Focused Funambulist Fyndhorn Brownie Gerrard's Command Gift of Growth Glamermite Granite Witness High Alert Hyrax Tower Scout Initiate's Companion Inspirit Instill Energy Jandor's Saddlebags Kiora, the Tide's Fury Legolas's Quick Reflexes Magewright's Stone Militia Rallier Mirran Spy Moment of Valor Niblis of the Breath Ornamental Courage Overtaker Prepare // Fight Prepare // Fight Provoke Puppet Strings Puppeteer Quirion Ranger Raggadragga, Goreguts Boss Rally the Righteous Ray of Command Refocus Retreat to Coralhelm Scryb Ranger Seeker of Skybreak Seize the Day Sewer-veillance Cam Soldevi Golem Sparring Mummy Spidery Grasp Spinal Embrace Staff of Domination Steady Aim Stonybrook Angler Teardrop Kami Teller of Tales Temporary Insanity Thassa's Ire The Moment Thousand-Year Elixir Threaten Tidal Bore Tolarian Kraken Twiddlestick Charger Vigean Graftmage

The only downside to Ormacar is his color identity, and even thats barely a downside