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PSA: Prismatic Concurrent Timelines will not transform your units into Prismatics.
Yesterday I crafted Prismatic Concurrent Timelines because the card is very fun but much to my disappointment it does not transform units into prismatics. Even if you play a prismatic card, it will transform into a non-prismatic.
I wrote to the support already, but it seems I low-rolled and the responses did not exactly give me confidence she actually understood and will take it to the team.
Either way, for now, save your disappointment and don't craft prismatic Timelines.
Riot_DanCast
That's working as intended.
Cards that are created by other cards are Prismatic if the creating card is.
If you had a Prismatic Farron, the Decimates he creates would be Prismatic even if your normal Decimates were not.