Assemble the Dreadnought

Whenever an artifact enters the battlefield under
your control, you may sacrifice it. If you do,
put an engine counter on Assemble the
Dreadnought. If you don't, scry 1.
When there are ten or more engine counters
on Assemble the Dreadnought, remove all
counters from it and sacrifice it. Then create
Dreadnought, the Floating Fortress, a legendary
20/20 colorless artifact creature token with indestructible and trample.