Quest for the Unholy Relic

Whenever you cast a creature spell, you may put
a quest counter on Quest for the Unholy Relic.
Remove five quest counters from Quest for the
Unholy Relic and sacrifice it: Search your library
for an Equipment card, put it onto the
battlefield, and attach it to a creature you control.
Then shuffle your library.
''It's the last thing we can call our own.''--Absalon