Decking out was definitely a risk in this archetype
Additionally, when the opponent activates an effect, this card can be shuffled back into the deck in order to get the original Blue-Eyes White Dragon onto the field, which, as discussed, is still very important to the archetype for a variety of different card effects
Can I Activate Abilities From My Graveyard
Grand Abolisher doesn't stop your opponents from activating abilities of artifact, creature, or enchantment cards in zones other than the battlefield (like cycling abilities, for example)
While the accuracy of the documentation surrounding the Golden Age of Piracy is debatable, that's not a debate I'm interested in having right now
On tails, you cancel the attack (it has no effects) and your confused Pokmon take three damage counters