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NeoArkadiaExosister Betrayal had mistranslated text that prevented it from properly working with the rest of the Exosister Deck:
When this card is activated: Add 2 “Exosister” monsters from your Deck to your hand, then discard 1 card. You can target 1 face-up monster you control; immediately after this effect resolves, Normal Summon 1 “Exosister” monster mentioned on that monster. If a monster(s) is sent to your opponent’s GY, even during the Damage Step: You can banish 1 of them (their choice). You can only use each effect of “Exosister Betrayal” once per turn.
It has since been corrected on the Official Database:
When this card is activated: Add 2 “Exosister” monsters from your Deck to your hand, then discard 1 card. You can target 1 face-up monster you control; immediately after this effect resolves, Normal Summon 1 “Exosister” monster mentioned on that monster. If a monster(s) is sent to your opponent’s GY, even during the Damage Step: You can activate this effect; your opponent banishes 1 of them. You can only use each effect of “Exosister Betrayal” once per turn.
Please note that the text of this card has been adjusted. Be sure and play with the version on this page, even if your physical card is different.
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