Inverse square law.

Supposing you are trying to tap the energies from planet X to cast the universal problem solving spell, fireball.

Supposing planet X is at its farthest, you can cast a fireball the size of a baseball. Half a year later the planet is at its closest and now your fireballs are the size of basketballs.

Everytime you halve the distance to a planet, the amount of energy you get from it quadruples for the same fissure size.

So if by tapping a planet that is a few light minutes away you get enough energy to create a basketball sized fireball, how fast will thermodynamics turn you into plasma.if you try to tap a planet that is zero inches away from you?

The local mage guild has probably gone quite out of their own way to prevent obnoxious mages from becoming walking nukes.

Inverse square law.

Supposing you are trying to tap the energies from planet X to cast the universal problem solving spell, fireball.

Supposing planet X is at its farthest, you can cast a fireball the size of a baseball. Half a year later the planet is at its closest and now your fireballs are the size of basketballs.

Everytime you halve the distance to a planet, the amount of energy you get from it quadruples for the same fissure size.

So if by tapping a planet that is a few light minutes away you get enough energy to create a basketball sized fireball, how fast will thermodynamics turn you into plasma if you try to tap a planet that is zero inches away from you?

The local mage guild has probably gone quite out of their own way to prevent obnoxious mages from becoming walking nukes.