Number 368 Language English Legal Formats Commander, Legacy, Vintage Not Legal Formats Alchemy, Brawl, Competitive Brawl, Historic, Modern, Pauper, Pioneer, Standard, Timeless Rulings (4/16/2021) You choose which creature to bring back after you mill five cards
Provided at least some of them tap for actual colored mana, that is
But according to Wizards, that's now a legal card in all formats of Magic
When the feature launched, it came with a stark warning regarding trading virtual cards for real money, in which the developers said, "If we confirm that a player has engaged in behavior that violates the Terms of Use, we will warn them, suspend their account, or take action." The guidelines laid out are pretty clear: don't profit from the app
You dont need to worry about your opponent proliferating when you can just throw a horde of Goblins and a few Lightning Bolts in their face instead.