Gorgon Collector

Petrify (At the end of each declare blockers step, put a Petrification counter on each blocking or blocked by this creature. Creatures with Petrification counters on them are colorless artifacts with no abilities.)
Whenever a creature blocking or blocked by Gorgon Collector becomes an artifact, create a colorless artifact token with "When this token enters the battlefield, exile target creature blocking or blocked by Gorgon Collector for as long as you control this token."