The Card List Alpha consisted of 403 non-promotional cards while Beta consists of 402
Any time you have priority, you may turn the face-down creature face up by revealing what its morph cost is and paying that cost

Decklist: Nethroi Mutate in Commander Nethroi, Apex of Death | Illustration by Slawomir Maniak Commander (1) Creatures (41) Acidic Slime Auspicious Starrix Beast Whisperer Boneyard Lurker Cavern Whisperer Chittering Harvester Cubwarden Dirge Bat Essence Symbiote Eternal Witness Faeburrow Elder Fiend Artisan Gemrazer Glowstone Recluse Golgari Grave-Troll Huntmaster Liger Insatiable Hemophage Karmic Guide Luminous Broodmoth Majestic Auricorn Migratory Greathorn Mindleecher Mysterious Egg Necropanther Nyx Weaver Old Rutstein Old Stickfingers Phantom Nishoba Polukranos, Unchained Ravenous Chupacabra Reclamation Sage Sawtusk Demolisher Skull Prophet Stitcher's Supplier Sun Titan Syr Konrad, the Grim The Walls of Ba Sing Se Toski, Bearer of Secrets Underrealm Lich Vulpikeet Zagoth Mamba Instants (7) Abzan Charm Back for More Deathsprout Despark Grisly Salvage Mythos of Nethroi Swords to Plowshares Sorceries (8) Buried Alive Cultivate Damn Eerie Ultimatum Farseek Kodama's Reach Migration Path Rampant Growth Enchantments (4) Crawling Infestation Deadbridge Chant Death's Oasis Guardian Project Artifacts (5) Altar of Dementia Arcane Signet Golgari Signet Indatha Crystal Sol Ring Lands (34) Blossoming Sands Command Tower Deathcap Glade Evolving Wilds Exotic Orchard Godless Shrine Golgari Rot Farm Indatha Triome Jungle Hollow Overgrown Farmland Overgrown Tomb Sandsteppe Citadel Scoured Barrens Temple Garden Temple of Malady Undergrowth Stadium Woodland Cemetery Plains x3 Swamp x6 Forest x8 This deck has a lot of interactions and combos to help you generate advantage

Creature - Human Wizard Color tag templates(None) Win
As you can see, the dork is a nasty on curve 6/5 trampler who can win you the game
So while Meddling Mage may not win you the game on its own, it is an important (and affordable) tool that will increase your odds greatly