Zellix, Sanity Flayer + Intruder Alarm + Phenax, God of Deception

Zellix, Sanity Flayer

Intruder Alarm

Phenax, God of Deception

How it works

1. Activate a creature you control by tapping it, causing a player to mill cards equal to that creature's toughness.
2. If a creature card was milled this way, Zellix triggers, creating a 1/1 Horror creature token.
3. If a Horror entered, Intruder Alarm triggers, untapping all creatures.
4. Repeat.

This clever loop relies on turning every milled creature into fuel for an unstoppable chain reaction. Phenax, God of Deception grants your board the ability to tap and mill opponents based on toughness, setting the whole engine in motion. When that mill hits a creature card, Zellix, Sanity Flayer triggers to reward you with a 1/1 Horror token. That new token entering the battlefield immediately wakes up Intruder Alarm, whose static ability untaps all your creatures so you can tap them to Phenax all over again.