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Help on who to focus on ranking up

So I pulled a few good 4* recently and have been ranking each of my favourites slowly to r3/r4. Now low on gold and not much tier 4 who should I concentrate on?
Should I consider synergy's?
My five stars are meh at best expect one or two so keeping them there for now (plus costly to rank at present)
I also just pulled massacre is he good with domino?
My other champs I use are 4* maxed and duped starlord, 4* quake maxed unduped, 5* iceman r3 (not enough r4 mutant for him)unduped maxed 4* unduped Hyperion.
Feel as thou domino, Aegon and nick Fury may be best to concentrate on??
Currently doing main game modes and act 4 if that helps.
Should I consider synergy's?
My five stars are meh at best expect one or two so keeping them there for now (plus costly to rank at present)
I also just pulled massacre is he good with domino?
My other champs I use are 4* maxed and duped starlord, 4* quake maxed unduped, 5* iceman r3 (not enough r4 mutant for him)unduped maxed 4* unduped Hyperion.
Feel as thou domino, Aegon and nick Fury may be best to concentrate on??
Currently doing main game modes and act 4 if that helps.
Help on who to focus on ranking up 15 votes
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Blade is another popular option but I do not have even as a 3 star so I cannot comment on that
Almost forgot about blade with him being dupped with that regen he's gonna save you a looooottttt of units lol between those 3 for sure.