Minefield

Strategy and Synergy
It's basically 30 dmg for 2. When the enemy moves around a lot, the mines will trigger multiple times, dealing more damage. The spell is especially strong against Terra, since she moves around a lot during her boss fight, triggering almost every mine, taking around 200 dmg each time the spell is cast. Against a few enemies that don't move around a lot, the spell is almost useless, only dealing about 60 dmg to each of them.

The spell's application depends on the player's preference, since it still is a free hit. There are better spells in this regard like, but those are a lot rarer or require deck setup.

It is definitely one of the best spells for beginners, since it doesn't need any aim and can allow the player to deal damage while concentrating on dodging.