Force of Negation and The Banyan Tree are reprints, and since they are in TLE, they are not Standard-legal
Remember that Mega Evolutions function differently from other cards (including EX) in Pokmon TCG Pocket, and reflect the new rules set by the Mega Brave and Mega Symphonia sets in the physical TCG: Knocking out a Mega Evolution card rewards you with 3 points, granting you an instant win in TCG Pocket
Beyond the synergy and card advantage, the deck plays a handful of powerful cards in the 99, such as Black Market Connections
One of the strongest slivers in all of Magic, for one mana of each color, this 7/7 sliver causes all other slivers to get +1/+1 for each other sliver in play, turning all of one's slivers into terrifying threats.
(It compares to Magmaquake for four and hits flyers but not planeswalkers)