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.
Bakura drop rate are worst than that punk Yugi Muto so far i have 9 Beast of Talwar not 1 single SR drop yet at this rate i will have like 24 Beast of Talwar Yugi Muto drop 31 Beaver Warrior for me lol not 1 single Union Attack or Toy Magician or Gandora Pathetic