C-class potions.
A plump glowing leech. A rose-smelling sewage.
When you drink a C-class potion, roll +COS. On a hit, suffer from side effects, hold 2 and ask the GM what move it grants. You may spend a hold to make that move. On a 10+, choose: you hold 3, or the side effects are lessened.
Which kind or really weird 2-5 word moves and side effects C-class potions may grant?
(I was thinking about old school / lamentation of flame princess kind of horrible, woundrous, bizarre effects.)
Grow fingers (somewhere)
Bones to jelly (will re-ossify, in whatever shape they were in)
Cleanse system (super-ipecac)
Change limbs to snakes (still attached, possibly friendly)
Erase facial features (better figure out how to breath)
Glowing breath (like fire breath but without the burning)
Become Translucent (not quite invisibility)
Recall location of small object (your keys)
Heal scratches & bruises (popular with children)
Grow older (faster than you do normally)
Chill blood (extremely uncomfortable but not deadly)
Make palatable (it tastes great, does not make it nutritious)
Form of camel (or a setting appropriate camelid like creature)
Well, that’s pretty comprehensive Nick. Ill add one just for the sake of not wasting a post.
Dark Vision (or other sense)
I’d also recommend taking a look at +ArnoldK’s recent post http://goblinpunch.blogspot.com/2016/05/the-perfect-potion-list.html