Reporting back to say "heal scaling" and "relentless strike" are both super, super strong. Got a die full of each and became completely unstoppable (farmed 50k hp and 200 damage a hit on a slime that had a weaker accelerating heal).
EDIT: Didn't even realize before that these cards both keep their power between rounds. Now I can just "relentless strike" to 1 shot every single creature, and the power keeps growing. Absurdly strong, and very satisfying.
