As an extra cost, destroy 4 Mechs and/or Moles you control.
Salvage 2
66
Explained
Unique301.2
You can't have a second copy on board.
As an extra cost, destroy 4 Mechs and/or Moles you control.306.5b
When you deploy it, choose 4 of your Mechs and/or Moles, anywhere on board, also exhausted or new ones. They are destroyed (801.9): they go to your scrapyard, unless their own text says otherwise. With fewer than 4, you can't deploy it (306.5b).
Salvage 2802.2d
In your own watch, while this card is in your scrapyard, you may pay this to return it to your hand. No one can react, and there is no limit per turn (802.2d).