Archon of Falling Stars + Animate Dead + Phantom Train

Archon of Falling Stars

Animate Dead

Phantom Train

How it works

1. Activate Phantom Train by sacrificing Archon of Falling Stars.
2. When Archon of Falling Stars dies, it triggers, returning Animate Dead from your graveyard to the battlefield.
3. When Animate Dead enters the battlefield, it triggers, returning Archon of Falling Stars from your graveyard to the battlefield, and attaching Animate Dead to it.
4. Resolve the Phantom Train ability
5. Repeat.

This clever loop relies on a continuous resurrection cycle fueled by the death-triggered recursion of Archon of Falling Stars. Whenever Phantom Train sacrifices the Archon, its demise triggers its own ability to return Animate Dead from the graveyard, which in turn brings the Archon right back while attaching itself to it. Because Phantom Train can repeatedly sacrifice the Archon as a cost, you can generate an infinite loop of leaves-the-battlefield, enters-the-battlefield, and sacrifice triggers while infinitely growing the Train with +1/+1 counters.