Foundry of a Great Champion

Foundry of a Great Champion enters the battlefield with ten Progress Counters on it.
Pay {e}{e}{e}{e}: Remove an Progress Counter from Foundry of a Great Champion.
When Foundry of a Great Champion has no Progress Counters on it, sacrifice it. If you do, create a legendary 10/10 colroless Construct artifact creature token with trample and indestructible named The Megawidget Colossus.