Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight, and Workhorse

Prerequisites

• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight on the battlefield
• Workhorse on the battlefield

Steps

1. Activate Workhorse by removing a +1/+1 counter from it, adding
2. If needed, repeat step 1 until Workhorse dies as a state-based action due to having 0 toughness
3. When Workhorse dies, It's persist ability triggers, returning it from your graveyard to the battlefield with three +1/+1 counters on it due to its ability
4. Reoeat

Results

• Infinite artifact ETB
• Infinite artifact LTB
• Infinite creature LTB
• Infinite creature ETB
• Infinite death triggers
• Infinite colorless mana