Coldstone

Description
The Frostbolt is not counted as a separate cast for the purpose of Flow decay, so after casting Coldstone with having Flow stacks up, you end up with a net increase of +1 Flow.

Strategy and Synergy
This spell can be good in any deck, even without the. The 200 damage for 3 makes it a tradeoff that surpasses many other spells that only focus on dealing damage. Especially in Bossfights the spell shines, outclassing Legendaries like due to being a high-damaging single hit spell.

The added and  are just icing on the cake, making it even better in  oriented decks, turning it into a spell with even higher damage.

Due to it's common rarity, there is a high chance of finding it in every run. Especially when lacking dps at the start of the run, Coldstone can provide a good option against the first few Bosses. After that, Coldstone just becomes the spell that is in the players deck, dealing damage, but not having any synergies, except when playing a oriented deck. Then it becomes a great damage source and.