Max mana
Max mana is the wand's total mana capacity. A spell's cost must be supported by available mana for the wand to cast it.
How it works
The guide gives Black Hole as an example of a spell whose cost exceeds the maximum mana of one sample wand, preventing that wand from casting it. The wiki also says Add Mana can allow a wand to cast spells it otherwise lacks the maximum mana to cast.
Your next step
Compare the cost of a desired spell with the wand's available mana.
Read the supporting references
Noita wand building, including wand stats, editing, and named spell choices supported by the supplied evidence. The evidence does not establish a specific patch or edition. Guidance explains the referenced mechanics; it is not a tested damage ranking. Check the stated edition and source version before applying a patch-specific detail.