900 000 dollars is an incredible price, unrealistic to offer for a piece of cardboard, but as a mad collector I totally understand the thrill to look at that card and think "Hah
The back of Pokmon cards stays the same but can be easily distinguished: English cards (European languages, Chinese, and Korean) have always had the same back
Miraidon is also a strong attacker, especially combined with Regieleki VMAX as hinted above but its attack requires three Energy
(Planeswalker cards with converted mana cost 0 likely not coming soon.) If Blood on the Snow is copied, no mana was spent to cast the copy, so you can return only a creature or planeswalker card with converted mana cost 0
Accelerators We'll use just a few mana rocks, and only the absolute necessary
Its actually not a terribly far-fetched concept though