Whenever you complete a Trap, you may pay 4 Force. If you do, take 1 40/3/3 Partisan Ambusher Subordinate with "Pay 0 Force Ambush 1" and put it into the Character arena.
Pay 0 Force Ambush 1
Keywords
Ambush
Ambush X: A layered, activated ability that means, "If your opponent deploys, moves, or puts a unit into this arena, this unit does X dice of damage to that unit." Each Ambush can be used once per instance of a unit being deployed, moved, or put.