Classic cards such as Massacre Wurm (creatures your opponents control get -2/-2 until end of turn, and then opponents lose 2 life per creature that dies) or Elesh Norn, Grand Cenobite (creatures you control get +2/+2, creatures opponents control get -2/-2) often destroy aggressive decks, especially if brought into play earlier than normally expected
In fact, you probably solve this entire mystery by going to over a WOTC forum and asking them why they're "using the old Pokmon holofoil" they'll stumble over themselves to "Um, actually" you and you'll get your answer
The reflective gleam looks amazing when you tilt it side to side and the texture is also nice to the touch
When you attempt to retreat, the game tells you that doing this is expensive, a waste of resources, and usually not a good idea
For those interested in the complete card list for this expansion, YGOrganization has composed quite an extensive list.