Iron Bank of Braavos

Iron Bank of Braavos enters the field tapped
{t}: Create up to three Treasure tokens.
In your upkeep pay {1} for each time you
activated Iron Bank of Braavos until you pay
mana equal to the number of Treasure tokens
you created with Iron Bank of Braavos. If you
can't, your opponent create X Treasure tokens
with X being the number of Treasure tokens
you created with Iron Bank of Braavos