Decks now belong to you, not just one playgroup

Until now, a deck lived inside a single playgroup. If you played the same deck in two different playgroups, you had to register it twice - re-entering the name, colors, decklist, and notes each time, and keeping both copies in sync by hand. Decks are now yours first. When you're adding a deck to a playgroup, a new "Use an existing deck" option lets you link one you've already registered elsewhere, in one click - no retyping anything. A few things follow from this: Hiding a deck, and the comments underneath it, are now per playgroup. You can keep a deck fully visible in one playgroup while hiding it in another, and each playgroup gets its own separate comment thread on that deck. "Delete" is now two separate actions: "Remove from this playgroup" just unlinks it there, while everything else about the deck (and its other playgroup links) stays put. "Delete permanently" removes it everywhere - only reach for that one if you really mean it. You can also check a deck's legality against a different format than the one it's tagged with, on demand - handy for checking whether your Pioneer deck happens to also be Modern legal, without retagging it. And your account page now has a "My decks" section listing every deck you own, across every playgroup you're in.