What it does
I don't have reliable information about a Magic: The Gathering keyword or ability called "Hypertoxic Miasma." This doesn't match any official MTG keyword, ability, or card name that I'm aware of.
It's possible this is a custom or fan-made card, a card from an unofficial set, or perhaps a misremembered name. There are cards with similar vibes—like "Toxic Deluge" (a board wipe that's hard to fight via indestructible) or the keyword "Toxic" (which deals poison counters alongside combat damage)—but "Hypertoxic Miasma" isn't something I can accurately describe.
If you can share the card's actual rules text or where you encountered it, I'm happy to break down how it works, the common rules pitfalls, and its role in Commander. I'd rather tell you I'm unsure than invent mechanics that could mislead your gameplay.
Iconic cards with Hypertoxic Miasma
See all 1 →