The Herald

When The Herald enters, create a Chrome token. {I}(It’s an artifact with “1, Sacrifice a creature: Create a Chrome token.){/I} Chrome tokens you control have “Tap: Add one mana of any color“. {Br}{Br}{Bg}{Bg}{B}{B}: Monstrosity X, where X is the number of Chrome artifacts tapped to pay this minus the number of Chrome artifacts you control.