Tier 4b, and gold sometimes, I get plenty of iso, alphas. The main problem is that most of my 5* aren't to good so I have no interest in getting them up which is why I don't run out of them as much as opposed to gold and tier 4bs.
I still have some tier 4c but never seem to have enough tier b and run out of them faster than anything else, and the gold as well since it goes quickly especially since I don't particularly run arena to much anymore.
Gold gold gold. I need t1a as well, but its not as big of a deal cuz I can buy them from the glory store. It'll become a problem again after using everything on t1a and nothing on t4b, then ill be short on t4b. It's a vicious cycle.
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I still have some tier 4c but never seem to have enough tier b and run out of them faster than anything else, and the gold as well since it goes quickly especially since I don't particularly run arena to much anymore.
But really Gold for me.
While I wait for them, I'm selling expiring ISO and building up gold.