Added a couple of other filters on the trading opportunities page:
- filter for users that have a completed trade within (x months / 1 year)
- filter for premium users

Imported the missing MH3 promo stamped cards (here: https://deckbox.org/games/mtg/printings?f=z73944 )
Imported missing Double-Faced Card Placeholder to Extras: Innistrad Remastered

Fixed format legality for Spiderman cards.

Nice! Thanks implementing my suggestions. This is great.

Always appreciate the constant improvements here