Aminatou, the Fateshifter, Heart of Kiran, and Sun Titan

Prerequisites

• Aminatou, the Fateshifter on the battlefield
• Heart of Kiran on the battlefield
• Sun Titan 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 Sun Titan
4. Aminatou is put into your graveyard as a state-based action due to having zero loyalty
5. Resolve the Aminatou ability, blinking Sun Titan
6. When Sun Titan enters the battlefield, it triggers, returning Aminatou from your graveyard to the battlefield
7. Repeat

Results

• Infinite LTB
• Infinite ETB