Emergency Disassembly

When you cast Emergency Disassembly, sacrifice
any number Mechanik's or artifacts, then choose
one:
•Add {c}{r} to your mana pool for each permanent sacrificed. If eight or more mana is generated, you
may use it to cast a card from your library
•Return a Mechanik from your graveyard with
CMC equal to the CMC of sacrificed permanents