While there is technically no maximum to how large your deck can be (as long as you can shuffle it), youll likely want to stay right at the standard minimum of 60 cards

Scientists Aang's Journey Abzan Monument Agency Outfitter Analyze the Pollen Archdruid's Charm Balamb T-Rexaur Beamsaw Prospector Bebop, Warthog Warrior Bedhead Beastie Beseech the Mirror Bioengineered Future Biomechan Engineer Biotech Specialist Black Chocobo Bloomvine Regent Borough Backup Brave the Wilds Brightglass Gearhulk Burnished Hart Bushwhack Call the Mountain Chocobo Campus Guide Canyon Crawler Caradora, Heart of Alacria Case of the Shattered Pact Case of the Stashed Skeleton Celestial Reunion Central Elevator // Promising Stairs Central Elevator // Promising Stairs Changeling Wayfinder Circuitous Route Cirina Bargainspinner Claim Jumper Clay-Fired Bricks Cloud, Midgar Mercenary Cloudbound Moogle Colossal Rattlewurm Compass Gnome Cool but Rude Cosmium Confluence Courier of Comestibles Cycle of Renewal Cynical Loner Daggermaw Megalodon Dance of the Tumbleweeds Dauntless Scrapbot Delivery Moogle Demolition Field Demonic Counsel Dina's Guidance Divert Disaster Down in the Valley Dragonstorm Forecaster Earthbender Ascension Edge Rover Elemental Teachings Elven Passage Embermouth Sentinel Emergency Eject Emeritus of Woe Encroaching Dragonstorm Environmental Scientist Escape Tunnel Everything Pizza Evolving Wilds Expedition Map Fabled Passage Fang-Druid Summoner Fateweaver Fierce Empath Flourishing Bloom-Kin

Devotion accumulates incredibly fast and this becomes a potent win condition in multiples or when flickeredor, and this is my favorite, paired with Saw in Half
With enchantment cards, Manifest Dread, and various other ways to enable graveyard filling, there will be lots of opportunity to benefit off Delirium in this set
Basically everyone, right