Felidar Guardian + Valkyrie's Call + Conspiracy + Phantom Train

Felidar Guardian

Valkyrie's Call

Conspiracy

Phantom Train

How it works

1. Activate Phantom Train by sacrificing Felidar Guardian.
2. When Felidar Guardian dies, Valkyrie's Call triggers, returning Felidar Guardian from your graveyard to the battlefield as an Angel.
3. When Felidar Guardian enters the battlefield, it triggers, blinking Conspiracy. Choose any creature type except "Angel" as Conspiracy enters the battlefield.
4. Resolve the Phantom Train ability.
5. Repeat.

This clever engine transforms the rails of Phantom Train into a revolving door for Felidar Guardian by leveraging a clever type-shifting loophole. With Conspiracy set to any creature type other than Angel, every creature you own—including Felidar Guardian—becomes that chosen type everywhere, meaning Valkyrie's Call will completely ignore them when they die. However, when Phantom Train sacrifices Felidar Guardian to fuel its ability, Valkyrie's Call steps in to resurrect the Guardian as an Angel, sidestepping its own restriction because the resurrected creature arrives with the Angel subtype. Finally, Felidar Guardian's entry trigger blinks Conspiracy to reset its chosen type if needed, allowing you to loop this sacrifice and resurrection cycle infinitely.