To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as a flashback cost), add any cost increases (such as kicker costs), then apply any cost reductions (such as that of Urianger Augurelt's last ability)
Burst Digivolving works by returning a Tamer to your hand to make the Digivolution cost zero, but what makes ShineGreymon: Burst Mode so much better than the other two Burst Mode Digimon, is that when Digivolving, you get to play the Tamer once again and be able to use it to get the final hit in to finish your opponent
As such, focus on messing up their gameplan first and dealing with defender creatures second
Play with the deck several times to get a feel for what it does well and where it feels lacking
Its a fitting artwork to the season that is already showing positive early signs on the secondary card market
If you're stepping into the world of Pokemon TCG, it might feel intimidating at first