According to a support post from the official Pokmon website, the old app will be shut down shortly prior to the worldwide launch of Pokmon TCG Live
Our very own Cas Hinds did an article showing you all of Tifa's best cards

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When an opponent's monster declares an attack while you control no monsters: You can Special Summon both this card from your hand and 1 "PSY-Frame Driver" from your hand, Deck, or Graveyard, and if you do, destroy the attacking monster, then end the Battle Phase
Popularity raises costs heavensward When a monumental crossover exceeds expectations, demand skyrockets and Magic the Gathering Final Fantasy is no exception
9 Buster Blader - Attack 2600 | Defense 2300 A slayer of dragons who grows more powerful as the number of draconic foes increases