Infinite untap of legendary creatures you controlInfinite mana legendary creatures you control can produce
How it works
If Aphetto Alchemist is not your Ring-bearer, use the card that causes the Ring to tempt you to cause Aphetto Alchemist to become your Ring-bearer, thus making it legendary.
Activate Ioreth's second ability by tapping it, untapping Aphetto Alchemist and another legendary creature.
Activate Aphetto Alchemist by tapping it, untapping Ioreth.