Romparex, the Eternal Engine

Whenever you cast a Dinosaur or artifact creature spell, that creature enters the battlefield with either a +1/+1 counter, a vigilance counter, a haste counter, or a trample counter on it and you put one of those types of counters on Romparex.
When Romparex dies, you may exile it. If you do, put a Dinosaur or artifact from your collection onto the battlefield with mana value X or lexx, where X is Romparex's power when it died.