Unstable/Random Magical Effects

Alchemical Mishaps, PDF, Alchemy

A Veritable Hoard of Homebrew — blightlandsofficial: dm-clockwork

99 listings on TCGplayer for Unstable Harmonics - Rhystic Study - Magic: The Gathering - Whenever an opponent casts a spell, you may draw a card

Unstable Harmonics - Rhystic Study

MTG Commander Masters Eldrazi Unbound precon decklist - Dexerto

Magical Thinking: Unstable, The First GOOD Un-set.

Gimme Five • Instant (Unstable) - MTG Assist

Arcanum - A New Age of Magic at Skyrim Special Edition Nexus

What about nuclear waste?

Unstable (Magic: The Gathering) - Wikipedia

Path of Wild Magic Barbarian Handbook: DnD 5e Subclass Guide - RPGBOT