You control an artifact, creature and/or land that can tap to produce at least ({2} magic symbol) .
Aminatou has at least two loyalty counters.
Steps
Activate an artifact, land and/or creature you control by tapping them, adding at least ({2} magic symbol) .
Activate Aminatou's second loyalty ability by removing a loyalty counter from it, targeting Teferi.
Rings of Brighthearth triggers, causing you to pay ({2} magic symbol) to copy Aminatou's ability, targeting Spark Double.
Resolve both Aminatou abilities, blinking Teferi and Spark Double, choosing to have Spark Double enter the battlefield as a copy of Aminatou.
Activate Teferi's first loyalty ability by putting a loyalty counter on it, targeting up to one land, artifact and/or creature.
Rings of Brighthearth triggers, choose not to pay for the trigger.
Resolve the Teferi ability, untapping up to land, artifact and/or creature you control and causing you to gain two life.
Activate an artifact, land and/or creature you control by tapping them, adding at least ({2} magic symbol) .
Activate Spark Double's second loyalty ability by removing a loyalty counter from it, targeting Teferi.
Rings of Brighthearth triggers, causing you to pay ({2} magic symbol) to copy Spark Double's ability, targeting Aminatou.
Resolve both Spark Double abilities, blinking Teferi and Aminatou.
Activate Teferi's first loyalty ability by putting a loyalty counter on it, targeting up to one land, artifact and/or creature.
Rings of Brighthearth triggers, choose not to pay for the trigger.
Resolve the Teferi ability, untapping up to land, artifact and/or creature you control and causing you to gain two life.
Repeat.
If the artifact, land and/or creature can produce at least ({3} magic symbol) , you may instead use Teferi's second loyalty ability once you have infinite mana to put your library into your hand, or you may instead blink any other desired permanent.