After 1 Counter Trap Card you control has been activated and has resolved, you can Tribute 1 DARK monster to Special Summon this card from your hand. If this card is Special Summoned in this way, destroy 1 card on the field.
Special summoning this card is relatively easy since you just need to "activate" a counter trap card. You do not have to negate/destroy a card your opponent uses by the counter trap card. Also there are useful low level DARK monsters.
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