Mikaeus, the Unhallowed, Blue, Loyal Raptor, and Carrion Feeder

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Blue, Loyal Raptor on the battlefield
• Carrion Feeder on the battlefield

Steps

1. Activate Carrion Feeder by sacrificing the other Dinosaur
2. When the Dinosaur dies, its undying ability triggers, returning it from your graveyard to the battlefield without a +1/+1 counter on it due to the -1/-1 counter it will gain from Blue
3. Resolve the Carrion Feeder ability
4. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite +1/+1 counters on Carrion Feeder