Aminatou, the Fateshifter + Spark Double + Rings of Brighthearth + Teferi, Who Slows the Sunset
Infinite Draw: Infinite blinking, Infinite card draw, Infinite lifegain, Infinite lifegain triggers, Infinite mana permanents you control can produce
Activate an artifact, land and/or creature you control by tapping them, adding at least {2}.
Activate Aminatou's second loyalty ability by removing a loyalty counter from it, targeting Teferi.
Rings of Brighthearth triggers, causing you to pay {2} 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}.
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} 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}, 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.
Cards: Aminatou, the Fateshifter, Spark Double, Rings of Brighthearth, Teferi, Who Slows the Sunset