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@optimuspig
Most recently:
Easy portal: L10 Optimus Prime (***) and L10 Soundwave (***): got 4 keys before video, and 5 keys with the video
Medium Portal: L10 Bumblebee (***) and L7 Arcee (***): got 3 keys before video, and 3 keys after the video
Hard portal: L10 Ultra Magnus (***) and L10 Energon Galvatron (***): got 2 keys before the video, and 3 keys after the video
It looks like Easy / Medium / Hard correlates to your success in getting keys.
So it’s probably not worth spending 200(?) gems to get the third slot on the Easy Portal.