All the Gold in Casterly Rock

Starting with you, each player may pay any
amount of mana. Each player creates X colorless
artifacts named Gold with "Sacrifice this artifact:
Add one mana of any color to your mana pool.",
where X is the total amount of mana paid this
way. Draw a card at the beginning of your next
upkeep.
"Extravagance has its uses. We must demonstrate the
power and wealth of Casterly Rock for all the realm
to see."