Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Ambitious Aetherborn + Carrion Feeder

Prerequisites

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Steps

1. 1Activate Carrion Feeder by sacrificing Ambitious Aetherborn.
2. 2When Ambitious Aetherborn dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3. 3When Ambitious Aetherborn enters, its fabricate ability triggers, putting a +1/+1 counter on it.
4. 4Resolve the Carrion Feeder ability.
5. 5Repeat.

Effects

• Infinite +1/+1 counters on a creature
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers