Play Trainer cards from your hand (you may only play one Supporter card and one Stadium card per turn)
Melffy Catty X EARTH Level 2 [ BeastEffect ] ATK 200 DEF 200 If your opponent Normal or Special Summons a monster(s) (except during the Damage Step), or if an opponent's monster targets this card for an attack: You can return this card to the hand, then you can add 1 Beast monster from your Deck to your hand, except "Melffy Catty"
Each forum has its advantages and drawbacks, so research them to find what works best for you (for example, eBay has the widest reach, is easy to use, and is trusted by buyers, but it also takes a 10% commission from your sale)
At the rate of how the game is quickly adapting, I do potentially see the final 3 Barrier Statues in the future receiving a status on the Forbidden section on the list
This turned into a super long post, but I still want to talk about Yu-Gi-Oh
The chaos ability is the most interesting, as it stands to net you a lot more mana than you can usually access in these colors