After many tries with all my r4 5*,i couldnt get passed ultron boss in act 5. I finally ranked my lowly 4* blade to r5 and took the trinity with me and a couple extra r4 5* for lane clearing. While i did have to use a few revives on ultron i finally completed the fight

And for my efforts i pull this gem of a 5*

Pretty fair trade id say. Now all i need is half a t5b and i can r5 my first 5* who would you guys suggest. My r4 5* currently are drax yondu winter soldier sparky iceman and luke cage.