If Mole Overlord would be put into your scrapyard from anywhere except the board, put it into your hand instead.
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Explained
Moles you control get +1 firepower and +1 hull.301.3b, 705.5a
While this card is on board, every Mole you control has 1 more firepower and 1 more hull, this card too, in your berth or dispatched, including Moles that come on board later. Your opponent's Moles don't get it. When this card leaves the board, the extra hull goes and the damage stays: a Mole whose damage then reaches its hull is destroyed (705.5a).
If Mole Overlord would be put into your scrapyard from anywhere except the board, put it into your hand instead.301.6a, 507.1a
Scrapped from your hand (for an engine, by a plunder), dug or reconned from your hold: it is shown and goes to your hand. It still counts as scrapped or dug, and an engine it pays for is installed. In the stow phase it can't be scrapped down to your hand size (507.1a). Destroyed on the board, it goes to your scrapyard.