Given how wildly popular zombies are in contemporary pop culture, its unsurprising that Theros creative team would figure out a way to incorporate them into their imaginary world
So every single Arena player has at least one copy of each of these cards

Full Necron Dynasties Commander Decklist Creatures (29) Szarekh, the Silent King Imotekh the Stormlord Anrakyr the Traveller Trazyn the Infinite Canoptek Scarab Swarm Canoptek Spyder Canoptek Tomb Sentinel Canoptek Wraith Chronomancer Cryptek Cryptothrall Flayed One Hexmark Destroyer Illuminor Szeras Lokhust Heavy Destroyer Lychguard Necron Deathmark Necron Overlord Plasmancer Psychomancer Royal Warden Sautekh Immortal Shard of the Nightbringer Shard of the Void Dragon Skorpekh Destroyer Skorpekh Lord Technomancer Tomb Blade Triarch Praetorian Arcane Signet Caged Sun Commanders Sphere Convergence of Dominion Cranial Plating Endless Atlas Ghost Ark Gilded Lotus Hedron Archive Mask of Memory Mind Stone Mystic Forge Necron Monolith Night Scythe Resurrection Orb Sceptre of Eternal Glory Sculpting Steel Sol Ring Thought Vessel Unstable Obelisk Wayfarers Bauble Instants (3) Darkness Defile Go for the Throat Beacon of Unrest Dread Return Living Death Mutilate Their Name Is Death Their Number Is Legion Biotransference Out of the Tombs The War in Heaven Barren Moor Desert of the Glorified Myriad Landscape Polluted Mire Reliquary Tower Tomb Fortress Vault of Whispers 30 Swamps With an impressive mix of creatures, artifacts, and spells, this Necron decklist is ready to dominate any Commander table

Even if any Enchanted averages near one per case, a specific Enchanted is much rarer because a set usually has several different Enchanted cards
By single use, I mean spells that have a one-time effect, such as instants and sorceries
Whenever it attacks, you'll exile the top card of each player's library, and you can play any number of the cards for free