Your best option is just to play more. 4 stars are sufficient up to uncollected. If it’s too difficult, grind arenas to get more units for revives. It helps hone your skills, improve your roster and gives you units.
T2 alphas needed for act 4 lmao. Act 4 has already been nerfed. Relax OP. When you are ready for them, T2 alphas will be available. I've got 6 in my stash atm.
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But seriously dude, you can beat Act 4 with 4*s. I beat Act 4 in mid 2017 with one R5 4* and 4 R4 4*s.
What's the rush anyway?