Vivisection

Strategy and Synergy
Vivisection is a quite dangerous spell to use due to the high risk of self-damage, however it is also highly profitable due to the 1-mana cost and the potential to deliver up to 300 damage in one go, this is higher than, while costing three less mana to cast. There is however a noticeable setup before using it efficiently.

Since the player must quickly move out of harm's way upon casting, the damage is generally split between three rows, provided that Vivisection is used correctly. can greatly help up with dodging the knives.

Unlike, this spell is a more suitable candidate for the upgrade. Even if you accidentally take the hit, the knives will still move ahead, hitting everything on the row. With the aforementioned candy wrapper, applying also becomes practical, though you should bear in mind the two extra knives.

Overall, vivisection has a good mana-to-damage ratio, but is fairly dangerous to cast in certain situations.