Generic positive effect-givers

There are a few generic random positive effect-givers. These all have an identical pool of positive effects.

The random positive effect-givers are:
 * Syringe
 * Mystery Meal
 * Plumbus

As of October 2nd, 2017, all of the "positive effects" in the pool are:
 * An Extra Turn
 * 1 permanent Speed
 * (Permanent) Arcane Vision
 * Star Power for 3 turns.
 * Spell Shield for 10 turns (currently bugged to give 12 turns).
 * Speed Boost for 2 turns.
 * Caffeine Rush for 6 turns.
 * Temporary Fire Immunity for 10 turns.
 * Temporary Frost Immunity for 10 turns.
 * 1 stack of Empowered Dice.
 * Big Goomba Crusher.
 * Delicious Aftertaste.
 * Ni! skill.
 * The Force.
 * Man Mode skill.
 * "No." for 12 turns.
 * Pacman for 7 turns.