First Day of Class + Phantom Train

First Day of Class

Phantom Train

How it works

1. Cast First Day of Class by paying 1.
2. Activate Phantom Train by sacrificing the persist creature.
3. When the persist creature dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
4. When the persist creature enters, First Day of Class triggers, putting a +1/+1 counter on the persist creature.
5. Resolve the Phantom Train ability.
6. Repeat from step 2

This brilliant loop transforms the interaction between First Day of Class and Phantom Train into an endless engine of growth and sacrifice. As you sacrifice your persist creature to activate Phantom Train, its persist ability brings it straight back from the graveyard, setting up a state-based cancellation where its incoming -1/-1 counter and the +1/+1 counter granted by First Day of Class wipe each other away. This leaves the creature completely pristine and ready to be sacrificed all over again, generating an infinite storm of creature entry, departure, death, and sacrifice triggers alongside unbounded +1/+1 counters.