Just to confirm this process:
- keep buying Silvers until it returns you 2 x 1500 req point cards, this unlocks all common, uncommon and rare reqs, then move onto Gold
- keep buying Gold until it returns you 2 x 3000 req point cards as you have then unlocked the remaining ultra rare and legendary reqs .
Definitely this, as LethalQ
If I may add that the silvers won't actually grant you exactly all the common reqs - but nearly all.
I think several Mongoose varieties are only found in Bronze packs.
So the best way to do it is to do what ZacBum
said for Silver and Gold, and once those are done (refunding req points) you can start buying a few Bronze packs until you get all the Mongoose varieties. The tough thing about opening Bronze packs is that they never refund any points - because they aren't guaranteed to unlock a permanent Req.
You just kinda have to know when you've unlock all the bronze pack items - which is why a lot of people suggest doing the Mongoose-Bronze last.
[EDIT]Just noticed that eLantern
kinda spelled this out already.