Salvage Fens

Salvage Fens comes into play tapped.
{t}Add {w} or {b} to your mana pool.
{2} Sacrifice Salvage Fens and another artifact,
put a mech from your graveyard onto the battlefield.

"Lucky duck must've bailed out on the one stretch
of firm, dry turf in thirty klicks. Even when I get
the power plant to turn over, we'll still need a heavy
VTOL to get it out of here."