User blog comment:BoltBlizard/PVZ Heroes RPG: Player Decks/@comment-24928690-20160501100759/@comment-5760976-20160502193326

All players start with 1 superpower trick and each time the block meter reaches max, you'll get another superpower trick.

As for tricks you get when you first start up the game (without unlocking anything), you get the superpower trick (as every hero has one) and a neutral trick for each side, all of which do the same as their opposing team's counterpart.