It's a static ability that turns into a triggered ability if its the first card drawn on any turn
The goal is to increase your hand size and prepare for the upcoming turn
The question if it was ever intended to be included in packs is not completely clear, but the discovery of E4 member styluspt that the cards was actually advertised to be in the set in a Japanese Trainers Magazine as well as on early concept designs of Jungle booster packs certainly makes this appear likely (see PIKACHU 1ST ED JUNGLE BLACK STAR PROMO - WAS IT INTENTIONAL
No, indestructible creatures are still dealt damage , they just don't die if lethal damage is dealt to them
You may reveal a character, item, or location card with cost 6 or less and play it for free
As players engage in daily card pulls, averaging at least ten cards from two packs, its common to accumulate duplicates