Aurelia, the Warleader + Seluma, Light of Aysen + Phantom Train
Aurelia, the Warleader
Seluma, Light of Aysen
Phantom Train
Infinite +1/+1 counters on a creatureInfinite creature ETBInfinite creature LTBInfinite combat damageInfinite combat phasesInfinite death triggersInfinite mana creatures you control can produceInfinite creature sacrifice triggersInfinite untap of creatures you control
How it works
Declare Aurelia and Seluma as attackers. Aurelia triggers, causing you to untap all creatures you control and to get an additional combat phase after this one.
Activate Phantom Train by sacrificing Aurelia.
Deal combat damage using Seluma. Seluma triggers, returning Aurelia from your graveyard to the battlefield.
Repeat.
This vicious loop turns your celestial commanders into an endless engine of war by feeding Aurelia, the Warleader's aggressive potential directly into Phantom Train's appetite. Because Phantom Train can sacrifice Aurelia for a +1/+1 counter, you can legally bin your legendary leader mid-combat and let Seluma, Light of Aysen swoop in to resurrect her through her graveyard-retrieving combat damage trigger. This continuous resurrection allows Seluma, Light of Aysen to repeatedly trigger Aurelia, the Warleader's extra combat phases and blanket untaps, letting you swing infinitely while growing Phantom Train to towering proportions.