Bowels of the Facility

Bowels of the Facility enters the battlefield
tapped.
{t}, add {c}{c} to your mana pool.
Whenever Bowels of the Facility is tapped, search
your library for an artifact creature
with converted mana cost {4} or less, and put
it into your hand.
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"And this is only the top layer! It goes down for miles!"
- Wheatley