Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Phantom Train + Arcbound Fiend
Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight
Phantom Train
Arcbound Fiend
Infinite artifact ETBInfinite artifact LTBInfinite artifact sacrifice triggersInfinite creature LTBInfinite creature ETBInfinite creature sacrifice triggersInfinite death triggersInfinite +1/+1 counters on certain creaturesInfinite +1/+1 counters on a creature
How it works
Activate Phantom Train by sacrificing Arcbound Fiend.
When Arcbound Fiend dies, its modular ability and persist ability trigger.
Resolve the modular trigger, putting Arcbound Fiend's +1/+1 counters on another artifact creature.
Resolve the persist trigger, returning Arcbound Fiend from your graveyard to the battlefield. It will not have a -1/-1 counter on it due to its modular ability.