70x7, is 490, for only 21 MW cores are still a lot, also self control in a video game? This isn’t real life.
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Lol 21 is more than enough. In addition you're earning multiple shards throughout weekly play, and you should be buying shards on a regular basis from spider. Personally, I don't even want MW cores included in the infusion process, but it is not a problem with common sense and self control.