Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Boss's Chauffeur + Phantom Train
Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight
Boss's Chauffeur
Phantom Train
Infinite +1/+1 counters on a creatureInfinite creature ETBInfinite creature LTBInfinite creature tokensInfinite death triggersInfinite creature sacrifice triggers
How it works
Activate Phantom Train by sacrificing Boss's Chauffeur.
When Boss's Chauffeur dies, its persist ability and second ability trigger.
Resolve the second trigger, creating a number of 1/1 Citizen creature tokens equal to the number of +1/+1 counters that were on Boss's Chauffeur.
Resolve the persist trigger, returning Boss's Chauffeur from your graveyard to the battlefield. It'll enter with a number of +1/+1 counters on it equal to the number of creatures you control minus 1 due to its replacement effect.