The Pokmon Company recently made a much-needed overhaul to trading in the game, removing the need for an extra currency
Its a sort of promo card similar to the buy-a-box promos, and they usually come in a foil version to act as an incentive to pick up a box when a new set releases
Once per turn, when your Warrior monster is targeted for an attack: You can make this card lose exactly 500 ATK, and if you do, negate the attack
Promo Info 3rd Anniversary Update Pack CLOSECLOSE ST8-06 U Digimon Lv.4 Parallel Rare Coredramon Color Blue Form Champion Attribute Vaccine Type Dragon DP 5000 Cost 6 Digivolve Cost 1 2 from Lv.3 Digivolve Cost 2 - Upper Text [Security] At the end of the battle, play this card without paying its memory cost.[On Play] Trigger Draw 2
Blood of Wolves sort of combines them both
By the looks of things, Invasion of Tarkir is already on the move price-wise, with copies climbing from around $3.50 to $5 over the last month