While considering Halloween Pokmon cards, practice caution and avoid focusing solely on financial gain
You can play more mana dorks to reliably get Seton, Krosan Protector on turn 2 and then all your creatures become Llanowar Elves
Ojer Axonil, Deepest Might, is a red God that rounds up the amount of noncombat damage your opponent suffers from any source to his current power - if he's ever killed, he flips into a land, and can be flipped back provided your opponent suffers four or more noncombat damage in a turn
Sorcery and enchantment cards also cost mana to play
None come quite so cool as the Arceus and Dialga and Palkia GX card
As for trading, the new feature was detailed last week, with a short paragraph dedicated to it in Thursdays news release: Players will need to use two new items, trade hourglasses and trade tokens, in order to trade cards with a rarity of 1-4 and 1 with cards of the same rarity