Lethal Vapors + Encroaching Mycosynth + Collector Ouphe

Lethal Vapors

Encroaching Mycosynth

Collector Ouphe

How it works

1. Whenever a creature enters the battlefield, Lethal Vapors triggers, destroying that creature.
2. Because Collector Ouphe prevents Lethal Vapors's activated ability from being activated, it cannot be destroyed due to its ability.

This clever lockdown relies on turning permanents into artifacts so that a single green gremlin can completely rewrite the rules of the battlefield. With Encroaching Mycosynth in play, Lethal Vapors becomes an artifact alongside its enchantment type, bringing it squarely under the watchful eye of Collector Ouphe. Because Collector Ouphe silences all activated abilities of artifacts, nobody can pay zero mana to destroy Lethal Vapors and skip a turn. Left entirely invincible to self-destruction, Lethal Vapors happily triggers to instantly obliterate every single creature the moment it enters the battlefield, locking down opponents for good.