Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Ashnod's Altar + Arcbound Condor
Infinite LTB, Infinite ETB, Infinite sacrifice triggers, Infinite death triggers, Infinite colorless mana, Infinite +1/+1 counters on certain creatures
Activate Ashnod's Altar by sacrificing Arcbound Condor.
When Arcbound Condor dies, its modular ability and persist ability trigger.
Resolve the modular trigger, putting Arcbound Condor's +1/+1 counters on another artifact creature.
Resolve the persist trigger, returning Arcbound Condor from your graveyard to the battlefield. It will not have a -1/-1 counter on it due to its modular ability.
Repeat.
Component Cards
How It Works
Activate Ashnod's Altar by sacrificing Arcbound Condor.
When Arcbound Condor dies, its modular ability and persist ability trigger.
Resolve the modular trigger, putting Arcbound Condor's +1/+1 counters on another artifact creature.
Resolve the persist trigger, returning Arcbound Condor from your graveyard to the battlefield
It will not have a -1/-1 counter on it due to its modular ability.
Repeat.