Nilfgaard
– Damage Engines with growing armor.
– Opponent Graveyard manipulation
– Statuses (Bleeding, Spying, Poisons, Purify, Locks, Doomed, Copy statuses).
– Point engines
– Point slam
– Clog
– Mill
– Boosts
– Self deck manipulation
– Opponent deck manipulation and reconnaissance (massively advantageous ex.Traearn to know when to canta).
– Hyperthinning
– Enslave
– Assimilate
– Copy leader ability of opponent
– Give Spying to cards in opponents deck
– Swarm
– Card spam/Duplication
Northern realms
– Engines / Damage Engines
– Pointslam
– Best Carryover/Resilience
– Swarm
– Removal
– Copying/Card spam/duplication
Syndicate
– Removal
– Swarm
– Pointslam
– Poisons
– Purify
– Deck manipulation
– Thinning
– Engines
Monsters
– Deathwish
– Resilience
– Pointslam
– Engines
– Control
– Bleeding
– Removal
– Swarm
Skellige
– Damage/removal
– Healing LOL
– Pointslam
– Discard
– Engines based on bloodthirst/Selfwound/Damage dealt.
– Own grave manipulation
– Purify
Scoiateal
– Engines
– Pointslam
– Movement
– Damage
– Handbuff
– Vitality
– Symbiosis – Creating treants
– Swarm
– Poisons
– Removal
Source: https://www.reddit.com/r/gwent/comments/11gx3cs/created_a_list_of_each_factions_tactics_they_are/
