You can use each effect among the (1)st and (2)nd effects with this card’s name only once per turn.
(1) During your opponent’s End Phase: You can target 1 Attack Position monster your opponent controls that did not declare an attack this turn; destroy that monster, and if you do, inflict damage to your opponent equal to its original ATK.
(2) If a “Rokket” monster(s) is Special Summoned to your field while this card is in your GY: You can Special Summon this card, but banish it if it leaves the field.