Body Launderer + Felidar Guardian + Mikaeus, the Unhallowed + Viscera Seer

Body Launderer

Felidar Guardian

Mikaeus, the Unhallowed

Viscera Seer

How it works

1. Activate Viscera Seer by sacrificing Felidar Guardian.
2. When Felidar Guardian dies, its undying ability and Body Launderer's first ability trigger.
3. Resolve the Body Launderer trigger, causing it to connive.
4. Resolve the Felidar Guardian trigger, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
5. When Felidar Guardian enters the battlefield, it triggers, targeting Body Launderer.
6. Holding priority, activate Viscera Seer by sacrificing Felidar Guardian.
7. When Felidar Guardian dies, Body Launderer's first ability triggers, causing it to connive.
8. Resolve the Viscera Seer ability from step 6, causing you to scry 1.
9. Resolve the Felidar Guardian trigger from step 5, blinking Body Launderer.
10. Resolve the Viscera Seer ability from step 1, causing you to scry 1.
11. Activate Viscera Seer by sacrificing Body Launderer.
12. When Body Launderer dies, its undying and second ability triggers.
13. Resolve the undying trigger, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
14. Resolve the second Body Launderer trigger, returning Felidar Guardian from your graveyard to the battlefield.
15. When Felidar Guardian enters the battlefield, it triggers, blinking any other permanent you control.
16. Resolve the Viscera Seer ability from step 11, causing you to scry 1.
17. Repeat.

This intricate loop relies on Mikaeus, the Unhallowed to grant undying to both Felidar Guardian and Body Launderer, turning every sacrifice into a recursive engine. By utilizing Viscera Seer to feed the creatures to the graveyard, you trigger Felidar Guardian's entry blink to repeatedly refresh Body Launderer and your other permanents. Meanwhile, Body Launderer's connive mechanic filters your hand while its death trigger helps swap and recycle pieces, ultimately letting you churn through your deck and reshape the battlefield indefinitely.