Once Platypus-Bear has attacked, it will remain an attacking creature for that combat, even if the Lesson card is removed from your graveyard
And we haven't seen a copy up for sale since, until a recent eBay listing appeared, offering a PSA 8 graded version for some pocket change - if you have giant pockets that can hold $2,000,000 / 1,606,000 worth of change, that is
The gift of a tapped fish is certainly Bloomburrow coded, but I think other gifts are definitely on the table in Wizards of the Coast's design department, so maybe we'll get a surprise
It's not unrealistic to win a game when you start with six cards, but it's noticeably less likely than when you start with seven
Essentially, the designers have taken a few of the highlight cards from select sets and given them alternate art by notable Japanese artists, making them unique, rare alternatives to their normal versions