Creatures opponents control entering the battlefield don't cause backup abilities to trigger.
At the beginning of your combat step, detain target creature with backup or vehicle an opponent controls. (Until your next turn, that permanent can't attack or block and its activated abilities can't be activated.)
Near Mint - £23.60
Lightly Played - £20.10
Moderately Played - £16.60
Heavily Played - £11.80
Damaged - £7.10
Near Mint Non English - £23.60
Lightly Played Non English - £20.10
Moderately Played Non English - £16.60
Heavily Played Non English - £11.80
Damaged Non English - £7.10