The goal of a Go-Shintai deck will often be to protect itself in the early game, find as many shrines as possible, stack their effects, and use a large game-swinging effect to lock out the competition
Stick to cash or a debit card
I use the -3 more often, as it's flexible and can always be used
In particular, I'm a fan of Origin Palkia/Origin Dialga- it shows off the physical capabilities of their new forms, especially the former
Curves have been lowered, aggressive colours expanded, more mechanisms have been added by which to turn traditionally slower cards into aggression
Alternatively, if a player dumps a powerful creature in their graveyard early in the game, you have a high likelihood of snagging it for yourself if most graveyards are still empty