You possess the mental abilities of Niv-Mizzet, granting you vastly increased mental abilities, to the level that experimentation with magic becomes entirely superflous, as you can perform them mentally. The degree of mental ability your magic gives you is enough that you can cast hundreds of spells in a moment that would take an ordinary master mage their full attention to form.
Project V17/Powers/Shardless/Magic and Mystic Power Upgrades/Firemind (Magic: The Gathering)
From Worm CYOA Wiki
Firemind (Magic: The Gathering)
Cost: 10 SP
Required: Colored Magic (Magic: The Gathering),Planeswalker (Magic: The Gathering),