You can buy any of them as often as you want. You can use multiple of them (which would be a waste) or feed the copys to your main to CR and SU her, since Spica only needs to be -2CR its pretty easy but i would only go for the first garunteed CR and only when you dont need to awaken anything.
Spica was nothing special until she was awakened. And only then I understood why Spica is highly recommended.
Let's see... Higher-than-your-average-archer attack speed, higher-than-your-average-platinum-archer damage-per-shot, lower-than-your-average-platinum-archer cost, VERY useful skill, which grants her more range and even more damage... Yep, she's nothing special at all, really)
I'm almost there to buy my 2nd Spica thanks to the Gold Rush and Total Domination giving lots of DC
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Victoria is better imo but not everybody can get her freely ofc.
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I only just CRed Spica once recently after awakening 10-ish units. For me those other awakenings to make my entire team stronger took precedence over a single unit at -1 cost. It depends on where your army is at and how you are going for awakening silver fodder/orbs.
Then you would be wrong. And i actually have all the archers in the game except victoria.
And considering how she comes at -1cr (and she gets another 100% chance to cr with another coppy) , and how easy her skill is to max (since she shares skill with lauren) , she tends to be better then all other plat archers.
Even then victoria , since spica has higher base damage , and a 7% increase passive. Sure her skill will give only 40% damage boost compared to victoria's 80% , but spica also gets ranged and a much higher skill uptime. To that add her stronger (and faster) normal attacks (due to higher base attack and 7%) , andthere are very few instances where i see victoria as an overall better archer...
NO no, you don't understand. She is nothing special until she became awakened. That awaken ability of hers is what really defines her. She turned maps I always lost on into 3* clears with that 7% damage boost for all archer units. Its such a huge increase in attack power.
It was only then I appreciated Spica and she became a major team member.