Act 6.1 offer or cavalier crystals?
So my roster can make it through 6.1 easily, and I'm 3.5k units away from the 12k needed.
Now my question is should I buy that offer or spend everything on cavalier crystals?
I don't have many good characters at the moment and don't even know who I'd rank up, so that makes me fell like I should buy crystals, but then again I'd probably get crappy champions.
So, what should I do?