Bonewidow

Flying, menace, first strike, vigilance.
Bonewidow can only be crewed by an operator.
Whenever a crew dies, shuffle your library,
then place Bonewidow 6th from the top.
If this is the 2nd time this action occurs, place
Bonewidow 12th from the top and so on until
it reaches the bottom of your library.
Then Exile Bonewidow.