This only applies to the same pack you triggered the effect on, though, so you'll want to take the game up on the offer before the pack rotates out of the shop.
It still has some heavy hitters, especially in the Extra Deck, and impressive combos to get important cards on the field.
The playstyle can be similar to beat downs, except the focus is on dealing damage with the cards from your extra deck that are Synchro summoned to the board.