Aqua Merdin

A thick green vile looking drink that tastes bitter and acidic.
When one drinks this rare potion, one regains 1d3+1 levels worth of spells. If one regains 4 or more levels worth of spell slots in this way, the next time one uses a spell slot one triggers a wild magic surge.
One can benefit from one dose of Aqua Merdin in a 24 hour period without experiencing side effects. If one drinks a second dose or more, one takes 1d12 psychic damage for each spell slot level regained. This damage can't be reduced or prevented in any way.
Aqua Merdin is extremely addictive.