Phyrexia: All Will Be One Phyrexia: All Will Be One introduced a tweaked version of the living weapon mechanic from Mirrodin Besieged
The original Teferi, Mage of Zhalfir design is nearly 20 years old by now and still quite powerful
Should Not Be "A List of Tournament Playables" : To me this suggests that tournament playability should not be part of the criteria of "epic-ness." Just being on the list of 50 most played cards in Standard does not make a card epic

black white token spawn EDH Creature (29) 1x Adaptive Automaton 1x Angel of Jubilation 1x Archdemon of Unx 1x Attended Knight 1x Benalish Commander 1x Bloodline Keeper Flip 1x Captain of the Watch 1x Cemetery Reaper 1x Darien, King of Kjeldor 1x Deathbringer Liege 1x Doomed Traveler 1x Geist-Honored Monk 1x Grave Titan 1x Hero of Bladehold 1x Kabira Vindicator 1x Kalitas, Bloodchief of Ghet 1x Marrow-Gnawer 1x Mausoleum Guard 1x Mikaeus, the Unhallowed 1x Ogre Slumlord 1x Phantom General 1x Precinct Captain 1x Requiem Angel 1x Skirsdag High Priest 1x Sublime Archangel 1x Sun Titan 1x Teysa, Orzhov Scion 1x Thraben Doomsayer 1x Twilight Drover Sorcery (12) 1x Army of the Damned 1x Conqueror's Pledge 1x Entreat the Angels 1x Gather the Townsfolk 1x Increasing Devotion 1x Lingering Souls 1x March of Souls 1x Martial Coup 1x Moan of the Unhallowed 1x Nomads' Assembly 1x Spectral Procession 1x Syphon Flesh Instant (5) Planeswalker (3) Artifact (3) Commander (1) Enchantment (10) 1x Endless Ranks of the Dead 1x Glorious Anthem 1x Honor of the Pure 1x Intangible Virtue 1x Leyline of the Meek 1x Luminarch Ascension 1x Marshal's Anthem 1x Militia's Pride 1x Murder Investigation 1x Necromancer's Covenant

it just provides solid value when youre playing modifications
This is just inherently true for many creatures, because even better than one strong creature is two strong creatures