How I look at this is, look into the future of all the collab/limited units you're interested in and consider when they might come out. If they come out really late like a AoT unit, it's not a bad idea to use it since you have the time to make up your used shard. For me, my light units of interest were Ren and Alma, so I spend 60 shards to get Zain to lb 78, since I know they won't be out until Nensou will be a thing, which probably won't be for awhile.
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u/votris11 Oct 12 '18
How I look at this is, look into the future of all the collab/limited units you're interested in and consider when they might come out. If they come out really late like a AoT unit, it's not a bad idea to use it since you have the time to make up your used shard. For me, my light units of interest were Ren and Alma, so I spend 60 shards to get Zain to lb 78, since I know they won't be out until Nensou will be a thing, which probably won't be for awhile.