It's hard not to reset at that point. You do need 1 of each fusion, and at least 2 Impenetrable Attack (I play 3), but you need to pull for a 3rd Laquari anyways, which necessitates pulling on a second box. So you'll probably pull those anyways, and could get a second Cosmic Cyclone.
Thanks for the insight. One last thing: I have 2 Sphere Kuriboh, 2 Half Shut, 3 Enemy Controller, 2 Wall of destruction and 2 Mirror Wall, should I still get 2 or 3 Impenetrable Attack?
Yes you need at least 2 imp attack if you want to build GB deck. Much more help if you have 3 in your deck tho. And don't forget to bring econ to counter dakini
It sounds like you've already got a lot of good backrow support, I would playtest the deck with what you've got to start out and see how often you end up in situations where you need more impenetrable attacks more often before you go spend the gems. No doubt it's a good card for the deck but I've played enough GB decks to see them work really well with all sorts of backrow setups
Each backrow option has different pros/cons for GB. Impenetrable Attack guarantees your monsters get cycled in and out but can sometimes be obvious to your opponent when they see that you can only activate your backrow card once the battle phase starts. Things like WoD and MW are sometimes less expected than IA, ECon, and half shut, and your opponent might lose a monster from attacking
My pleasure to duel with you anon, let's take a look how far you can get with your GB deck. I will also use my GB deck so we both know what we really need between our GB decks. If you agree then please let me know. I will wait your reply on thia comment.
Try aim for at least one of the fusions as they are a must since the sr fusion can stop monster effects like man eater while attacking, 3 impenetrable attack is a real tech in a gb deck but 3 half shuts are good, especially when against sergeant electro or mirage dragon