I don't know of a specific guide, but bastet is a color independent combo lead. which means you can use almost any strong cards for anything but descends.

IMO you should look to pickup these guys:

Chu Chu - Heartbreaker Green with TPA - drops from accessible heros dungeons Heros Hideout

Echidna - most common accessible delay card - great utility for most early content

You can put those two on a team with Godin and clear a lot of content with an open spot for whatever you feel like.

The main difference between D/G bastet and G/L bastet is the devil typing. It allows you to use cards like baddie and lubu to spike your damage higher for mid-to-late descends. devil cards have a much wider array of good-to-great cards than just green-color, so IMO it's a better ultimate if you can meet the combo requirements. for example: if you skill up and level your vampire he can still be used on a D/G bastet team later if you get a baddie.

conversely G/L bastet is a healer type, which generally have higher RCV and lower attack. you could use king shinee with G/L bastet and then aim to get valkerie and some other L colored healers and have a decent team with an easier combo requirement. I personally prefer devils over healers because I would rather have the higher attack power, but you should play what you want, and it's much easier from a materials cost to roll up to G/D bastet later if you don't have the devil-lit to start. don't be afraid to ultimate bastet to G/L and then if/when you get the devil subs roll-back and then ultimate again to the G/D.