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Illusion0410

I got all 4* they are rank 4 lvl 40 mordo, rank 3 lvl 30 airwalker, rank 3 lvl 30 captain america infinity war, rank 3 lvl 30 killmonger, rank 3 lvl 30 carnage, i have 2 tier 4 basic cataylst, how do i get another one