Aminatou, the Fateshifter, Heart of Kiran, and Shepherd of the Clouds

Prerequisites

• Aminatou, the Fateshifter on the battlefield
• Heart of Kiran on the battlefield
• Shepherd of the Clouds on the battlefield

Steps

1. If Aminatou has two or more loyalty counters on it, activate Heart of Kiran by removing a loyalty counter from Aminatou, causing Heart of Kiran to become an artifact creature until end of turn
2. Repeat step 1 until Aminatou has one loyalty counter on it
3. Activate Aminatou's second loyalty ability by removing a loyalty counter from it, targeting Shepherd of the Clouds
4. Aminatou is put into your graveyard as a state-based action due to having zero loyalty
5. Resolve the Aminatou ability, blinking Shepherd of the Clouds
6. When Shepherd of the Clouds enters the battlefield, it triggers, returning Aminatou from your graveyard to the battlefield
7. Repeat

Results

• Infinite LTB
• Infinite ETB