This rule had a minor impact on the format's success, although it is one of its trademarks
Harsh Mentor is definitely not a Minotaur, but at least there are curved horns in the art, and that has to count for something, right

Scientists Abandon Hope Abian, Luvion Usurper (playtest) Abolish Absorb Vis Academic Dispute Academy at Tolaria West Acceptable Losses Akroma's Blessing Akroma's Vengeance Alabaster Host Intercessor Alberix, the Trade Planet (playtest) Alexi, Zephyr Mage Amber Gristle O'Maul Amugaba Ancestral Memories Ancient Excavation Angel of the Ruins Anje's Ravager Anurid Brushhopper Anvil of Bogardan Apocalypse Aquamoeba Arc Mage Arcane Subtraction Arm-Mounted Anchor Arrogant Wurm Artificer's Intuition Artillery Enthusiast Ash Barrens Astonishing Spider-Man Asylum Visitor Atemsis, All-Seeing Attunement Aura Extraction Avaricious Dragon Aven Trooper Avenger en-Dal Awaken the Honored Dead Backslide Bag of Holding Balamb T-Rexaur Balance Balduvian Horde Balloon Peddler Balshan Griffin Bandit's Talent Barbarian Bully Barkhide Mauler Barren Moor Basking Rootwalla Battle Plan Battlewing Mystic Bazaar of Baghdad Bebop, Warthog Warrior Bedhead Beastie Bedlam Reveler Behold the Beyond Binding Negotiation Blasted Landscape Blaster Mage Bloated Toad Blood Fountain Blood for the Blood God

Even though its not legal to play, its still valued by the community
Challenging him is difficult to begin with, given that he is also Evasive
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