Aminatou, the Fateshifter, Spark Double, and Oath of Teferi

Prerequisites

• Aminatou, the Fateshifter on the battlefield
• Spark Double on the battlefield
• Oath of Teferi on the battlefield
• Aminatou and Spark Double have at least three loyalty counters each

Steps

1. Activate Aminatou's second loyalty ability by removing a loyalty counter from them, blinking a permanent you own
2. Activate Aminatou's second loyalty ability by removing a loyalty counter from them, blinking Spark Double and choosing to have it enter as a non-legendary copy of Aminatou
3. Activate Spark Double's second loyalty ability by removing a loyalty counter from it, blinking a permanent you own
4. Activate Spark Double's second loyalty ability by removing a loyalty counter from it, blinking Aminatou
5. Repeat

Results

• Infinite blinking of permanents
• Infinite ETB
• Infinite LTB
• Infinite mana lands you control can produce