Ayana Tanaka, Master of Rings

When Ayana Tanaka enters the battlefield, create
Sol Ring, a colorless artifact token with "{t}: Add
{c}{c}."
Whenever you tap four or more artifacts you
control, you may tap Ayana Tanaka. If you do,
untap target artifact.
Not everybody lost the knowledge to trap the distant
star's light in a ring of purest gold.