Aminatou, the Fateshifter, Spark Double, Rings of Brighthearth, and Teferi, Temporal Archmage

Prerequisites

• Aminatou, the Fateshifter on the battlefield
• Spark Double on the battlefield
• Rings of Brighthearth on the battlefield
• Teferi, Temporal Archmage on the battlefield
• You control up to four permanents that can tap to produce at least
• Aminatou has at least two loyalty counters

Steps

1. Activate up to four permanents by tapping them, adding at least
2. Activate Aminatou's second loyalty ability by removing a loyalty counter from it, targeting Teferi
3. Rings of Brighthearth triggers, causing you to pay to copy Aminatou's ability, targeting Spark Double
4. Resolve both Aminatou abilities, blinking Teferi and Spark Double, choosing to have Spark Double enter the battlefield as a copy of Aminatou
5. Activate Teferi's second loyalty ability by removing a loyalty counter from it, targeting up to four permanents
6. Rings of Brighthearth triggers, choose not to pay for the trigger
7. Resolve the Teferi ability, untapping up to four permanents you control
8. Activate up to four permanents by tapping them, adding at least
9. Activate Spark Double's second loyalty ability by removing a loyalty counter from it, targeting Teferi
10. Rings of Brighthearth triggers, causing you to pay to copy Spark Double's ability, targeting Aminatou
11. Resolve both Spark Double abilities, blinking Teferi and Aminatou
12. Activate Teferi's second loyalty ability by removing a loyalty counter from it, targeting up to four permanents
13. Rings of Brighthearth triggers, choose not to pay for the trigger
14. Resolve the Teferi ability, untapping up to four permanents you control
15. Repeat
16. If the four permanents can produce at least , you may instead use Teferi's first loyalty ability once you have infinite mana to put your library into your hand, or you may instead blink any other desired permanent

Results

• Infinite blinking
• Infinite card draw
• Infinite mana permanents you control can produce
• Infinite untap of permanents you control