Silmarils of Feanor

When Silmarils of Feanor enters the battlefield,
each player creates a Silmaril artifact token with
"{t}: Add {c} to your mana pool."
Other Silmarils have indestructible and "At the
beginning of your end step, if a player dealt 5 or
more damage to you this turn, that player gains
control of up to one target artifact you control."
Creatures you control get +2/+2 for as long as
you control two other Silmarils.