Kokusho, the Evening Star Speaking of Kokusho, it was the first card (September 2008) that we banned because of its demonstrated impact on games
Yahenni, Undying Partisan : Legendary Creature (Aetherborn Vampire), casting cost of two generic and one black mana, 2/2
This means that different cards have very different values inside Japan than outside it
The Triumphant Light expansion pack is the second mini-set to have arrived in Pokemon TCG Pocket, and while it doesnt feature any meta-changing Pokemon, it does have plenty of cards for you to pull that can bolster your existing decks
There is also a token sub-theme, with 8 cards allowing you to make creature tokens
Customizing Card Conjurer If you havent looked at it, I highly recommend trying out