Aedon, the Siren's Song

At the beginning of their upkeep, unless Aedon, the Siren's Song is removed from
the game, players may create a colorless
treasure artifact token with "{t} Sacrifice this artifact: Add one mana of any color" in
exchange for disregarding rule 903.9 for
the duration of their turn.
Alas it is a boring song but it works every time.