Energizer

Description
The shot deals 30 more damage for each time this spell has been cast that battle. The bonus damage is applied before the shot is fired, which means the first shot will deal 120 damage.

Strategy and Synergy
Has no particular synergy with other spells, and can be used as a standalone spell in every deck. Ramps up faster in smaller-sized decks where it can be cast more often.

In decks where it cannot be cast very frequently, it's typically not worthwhile as 120 damage for 2 mana isn't particularly great. However, by the second shot it becomes quite average, and beyond that it becomes increasingly above average. The damage is always 90+(Shot#*30).