Unfinished Boeing B-17 F.F.

Construct 6 (This enters with 6 construction counters on it. Once 6 turns pass, sacrifice Unfinished Boeing B-17 F.F., and search your library for a B-17 Flying Fortress, and place it
on the field tapped.)
If Unfinished Boeing B-17 F.F. takes
damage, it is killed, and the counters are destroyed.