Number of cards per pack: 9 cards
I think it's a good question tho, and definitely one that anyone interested in actually designing an effective Tinker-friendly environment needs to actually try to answer, because it's an easy space to get lost in thinking theoretically while neglecting real-play considerations imo
banish all monsters in your opponent's GY, and if you do, inflict 500 damage to your opponent for each
The total number of MTG cards depends on what Magic: The Gathering card count you want to use there are around 27,000 unique cards, but many more if you start to include reprints, variants, and out of game cards like art cards and tokens
340 HP is quite a number to tackle and that means most decks wont have a valid way to OHKO it
During the End Phase of a turn this card was not destroyed due to its own effect, you can send it to the Graveyard