Meta verdict
Duration
Synergy
Counters
Tanks such as Tigreal and Fredrinn that take more damage from her HP percent attacks.
No written guide for Karrie yet.
Ask for a guide →Small base HP increase but lower HP growth. Skill 1 and ultimate are more expensive mana-wise. Slightly tankier but less comfortable.
Higher base HP for early survivability. Mana costs increased, especially ultimate (up to 150). Tankier early but less ability spam.