It's worth noting that Eerie isn't limited to once per turn, meaning you can trigger it multiple times, say by playing a Room and fully unlocking it
Before it was banned, this card could flat-out remove a win condition (by not letting a player run out of cards), drastically extend battle times, let repeated Trainer cards be played, and allow for frequent deck skims

Abigale, Poet Laureate Abjure Absorb Absorb Energy Abstruse Interference Access Denied Acornelia, Fashionable Filcher Admiral's Order Adrix and Nev, Twincasters Adventurous Eater Aegis Sculptor Aether Spike Alessos and Pras, Acrobats Amazing Acrobatics Amulet of Safekeeping An Offer You Can't Refuse Angelic Cub Annul Anticognition April O'Neil, Human Element Arbalest Engineers Arcane Archery Arcane Denial Arcbound Tracker Archive Dragon Archmage's Charm Arenson's Aura Aria of Flame Armguard Familiar Armored Armadillo Artifact Blast Artistic Refusal Assert Authority Assimilate Essence Atmosphere Surgeon Autonomous Assembler Avoid Fate Axebane Ferox Bag Check Bane's Contingency Bant Charm Bar the Gate Baron Von Count Beast Mode Benevolent River Spirit Bind to Secrecy Blazing Bomb Blink Bloodcrazed Hoplite Bloomwielder Dryads Blue Elemental Blast Blue Marvel, Adam Brashear Bogslither's Embrace Bone to Ash Briarknit Kami Brine Seer Brine Shaman Bring the Ending Broken Ambitions Broken Concentration Bronze Guardian Brush Off Budoka Pupil Budoka Pupil Burly Breaker Burnout Busted

Sharpe Ratio of 0.81: Strong risk-adjusted return, outperforming conventional equity benchmarks like the SMI
C Common Darklord Zerato X DARK Level 8 [ FairyEffect ] ATK 2800 DEF 2300 If you have 4 or more DARK monsters with different names in your Graveyard, you can Tribute Summon this card by Tributing 1 DARK monster