Build Highlights: Exile cards and cast them for massive value, then finish the job with game-ending haymakers
Milling is the best, and one of the reasons you see milling used is that it is perfect for cards like this one

Adaptive Sporesinger Agent Frank Horrigan Atomize Atraxa, Praetors' Voice Blightbelly Rat Bloated Contaminator Bloom Hulk Brimaz, Blight of Oreskos Brokers Confluence Cacophony Scamp Cankerbloom Carnival Elephant Meteor Carnivorous Canopy Cayth, Famed Mechanist Contagion Clasp Contagion Engine Contagious Vorrac Contaminant Grafter Contentious Plan Copper Longlegs Core Prowler Courage in Crisis Dreamtide Whale Drown in Ichor Everythingamajig Evolution Sage Expand the Sphere Expansion Algorithm Experimental Augury Ezuri, Stalker of Spheres Filigree Vector Flux Channeler Fuel for the Cause Gitaxian Anatomist Glistening Sphere Grateful Apparition Grim Affliction Guildpact Informant Gulping Scraptrap High Perfect Morcant Huatli's Raptor Ichormoon Gauntlet Inexorable Tide Karn's Bastion Kilo, Apogee Mind Kiora's Dambreaker Lulu, Stern Guardian Martyr for the Cause Merfolk Skydiver Mesmerizing Dose Metastatic Evangel Mutational Advantage Norn's Choirmaster Park Heights Maverick Patrolling Peacemaker Phyrexian Seedling (playtest) Plaguemaw Beast Planewide Celebration Pollenbright Druid Proud Pack-Rhino Radstorm Recon Craft Theta Reject Imperfection Ripples of Potential Roalesk, Apex Hybrid Scheming Aspirant Serum Snare Smell Fear Spread the Sickness Staff of Compleation Steady Progress Surge Conductor

one goes into Veils of Fear and the other goes into Oubliette
Enduring Curiosity is the best of these because of the huge upside of the card draw: Each creature that deals combat damage to an opponent draws you a card