Innistrad

Unknown

Edit: Come to think of it, Greed, Red and White are Nissa's strong colors, so that's probably what the ingame display is trying to tell us. Not the Deck color, but the best match colors.

That's exactly what it means. Nothing to do with the colors of the cards in the deck.

Unknown

Good to know. Update at the end of the month and we all get fat packs hooray!