The package stops the 'magic depleted' debuff, so your simmies can cast magic even though their magic bar is empty. My additional tips would be:
- Have an aura on 24/7
- Fairy Prank objects until you get to level 5
- Once you get to level 5, use bloom on mushrooms, because you can use it 4 times in a row, (Five times if you've just planted it) then harvest, then 4 more times, whereas other plants you only need to bloom once - unless it fails.