Exchange of Words, Wormfang Manta, Aminatou, the Fateshifter, Spark Double, and Starfield of Nyx

Prerequisites

• Exchange of Words in hand
• Wormfang Manta on the battlefield
• Aminatou, the Fateshifter on the battlefield
• Spark Double on the battlefield
• Starfield of Nyx on the battlefield
• available

Steps

1. Cast Exchange of Words by paying
2. When Exchange of Words enters, it triggers, exchanging the text boxes of itself and Wormfang Manta
3. Activate Aminatou's second loyalty ability by removing a loyalty counter from it, blinking Exchange of Words
4. When Exchange of Words leaves the battlefield, its ability from Wormfang Manta's textbox triggers, causing you to take an extra turn after this one
5. When Exchange of Words enters, it triggers, exchanging the text boxes of itself and Wormfang Manta
6. Activate Spark Double's second loyalty ability by removing a loyalty counter from it, blinking Aminatou
7. Activate Aminatou's second loyalty ability by removing a loyalty counter from it, blinking Spark Double
8. Choose to have Spark Double enter as a copy of Aminatou that isn't legendary
9. Repeat from step 3 each turn

Results

• Infinite turns
• Lock