You're introduced to FF7 Rebirth's card game near the start of the story as you leave the hotel in Kalm. The innkeeper leaves you a Starter Deck on your room's door handle, and from there, you're free to start challenging the players marked on the map.
To earn more cards, it's simply a case of beating every Queen's Blood player you find. Generally, there will be new players in each region you visit, and they occasionally pop up - especially for special matches - in places you've already visited. You should also check every shop you visit, as some sell packs.
Here's the full list of cards, along with their power, cost, and ability.
Security Officer
Riot Trooper
Grenadier
J-Unit Sweeper
Queen Bee
Toxirat
Levrikon
Grasslands Wolf
Mu
Mandragora
Elphadunk
Cactuar
Crystalline Crab
Quetzalcoatl
Zu
Devil Rider
Screamer
Flan
Crawler
Archdeacon
Ogre
Deathwheel
Fleeting
Zemzelett
Ignilisk
Capparwire
Mindflayer
Scrutineye
Hell Rider II
Flametrooper
Spearhawk
Sea Devil
Shoalopod
Crown Lance
Tonberry King
Sandhog Pie
Bloatfloat
Bagnadrana
Cockatrice
Heatseeker
Bomb
Thug
Death Claw
Landworm
Sandspitter
Chimera
Joker
Amphidex
Frightflower
Gagighandi
Insectoid Chimera
Gigantoad
Maloceros
Grandhorn
Great Malboro
Grangalan
Amalgam
Skeeskee
Griffon
Basilisk
Reapertail
Jabberwock
Desert Sahagin
Cavestalker
Stone Golem
Two Face
Gi Specter
Valron
Twin Brain
Rictus
Diabolic Variant
2-C SOLDIER Operator
Ifrit
Shiva
Ramuh
Titan
Leviathan
Chocobo & Moogle
Fat Chocobo
Posh Chocobo
Moogle Trio
Magic Pot
Materia Guardian
Midgardsormr
Mythril Golem
Terror of the Deep
Grasptropod
Custom Valkyrie
Gigatrice
Anuran Suppressor
Specimen H1024
Crimson Mare Mk. II
Forgotten Specimen
Rufus
J-Squad
Chocobo Jockey
Space Ranger
Haunted Hotel
Skywheel
Loveless
Saucer Squad
Dio
Sephiroth
Emerald Witch
Shadowblood Queen
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