When this Location is completed, gain 4 Force.
When each turn starts, each player secretly bids Force. Whoever bids higher gains control of this Location until end of turn.
When this arena's battle step starts, the player who controls this Location may choose a unit card with this arena's type in any discard pile. If that player does, that player pay X Force, where X is the printed build cost of the chosen unit card, and puts it into this arena untapped.