this most often comes from combat, but few people who have been on the bad side of a Lightning Bolt or Grapeshot would dispute their value
Once, during this End Phase, if the number of cards in your hand is more than the number of cards your opponent controls +6, you must randomly shuffle cards from your hand into the Deck so the number in your hand equals the number your opponent controls +6
Each has a Continuous Effect to be unaffected by your opponents activated effects, unless they target the card, each has an effect when Special Summoned, and each has an effect associated to a prior iteration of the monster for BLS, it borrows the ability to attack again with 1500 extra ATK after destroying a monster by battle, and for BCDCM, it borrows the effect of Chaos Scepter Blast to banish an opponents card face-down
It see play in 1 formats: Conquest
Gengar was always my favorite Pokmon