Previous examples of the Alpha Black Lotus (the first series of MTG cards is called the Alpha series) had gone for as much as $250K, but this more than doubled the record and the general reaction was of astonishment
If you can't find something in particular, post a list of what you're missing
When you can't find the cards you need to bounce them around for free lore and prizes, you should focus on your Resist cards and use Mouse Armor to give Resist to your vanilla cards like Prince Naveen and Lilo, allowing them to quest safely and forcing your opponent to overspend their resources to deal with them
Any "regular" play mode (e.g., "Ranked", "Ranked Draft", "Quick Play") was intended to be best-of-one and was initially referred to by WotC as "Arena Standard" outside of the client
Even the much cheaper English variations of the Traveling Chocobo can range anywhere between $700 all the way up to $900, with no signs of slowing down, easily surpassing any other card in the set by a landslide