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@optimuspig
I’m going for Crates.
I only grind overpowers for the TFs that I like enough to have promoted with sparks.
If a Crate pops an Overpower for one of the other TFs that’s fine, but I only put in the effort to earn enough tokens for an Overpower if it’s a TF that I’ll actually use, like say a Grimlock or UM or Blaster.