Youre not a wizard anymore
The split between English and Japanese releases comes down to print quality, distribution, and market demand: English Releases: Feature natural yellow borders, standard booster pack pulls (often 1 in 2 boxes), highly variable factory cuts, and a massive grading population due to global collector demand
A Platinum Angel that can be flashed in is quite cool, and in many decks having a Platinum Angel that isnt an artifact means it has a higher chance of staying around, as it wont die to Shatter effects on top of creature removal
It's a two-mana Spell Pierce combined with a two-mana Shock (that can't even hit players) combined with a two-mana Faithless Looting (without flashback)
There are some downsides to offerup, one being that most buyers like to offer you less than your listed price
Arena will focus on Standard, whereas Magic Online will focus on older formats like Modern, Legacy, Vintage, Cube, etc