Mana costs for all 5 spells, and the scene or seal that teaches each one
Data from build 25583279, updated
Full Restore comes first, on mines floor 10, and sets your mana pool to 4. Every seal you break after that adds 4 more, until the pool tops out at 16 with the Fire seal down. Summon Rain is the one you’ll cast daily: 4 mana waters the farm. Growth costs 8 and finishes a 3x3 patch of crops on the spot, so save a full pool for it late in a season.

Healing
Restores all of your Stamina and HP when cast.

Farming
Summons a brief rain storm that waters all of your crops when cast.

Farming
Fully grows crops in a 3x3 area when cast. It can also progress tree growth by 1 stage.

Offense
Projects a stream of fire that can be used to destroy objects and monsters for a short time.

Utility
Illuminates dark floors in the Ruins deep underground.