Board Thread:Game Discussion/@comment-10151975-20130528214159/@comment-9477730-20130529022100

I mostly use the metal for upgrades ... so if I have something to upgrade or credits, then I will open metals to do so. I was upgrading comsos today and a R4 megatron appear to complete the alt mode & then I got a R4 ironhide right after it ... but that's after 2000-2500 metal of nothing.

I wouldn't open metal just to see if I get r4 cards. Although if you are looking for R3, then go for it.