The Technomancer
card-carrying scientician
Okay I could be reading too much into this but this quote feels (consciously or not) a bit too on the nose:
More evidence for Avacyn is Nahiri theory? Not a huge fan of it, but...We experimented with a few different versions, but all of them involved the hedrons neutralizing a big creature. We ended up with the current version, because an Oblivion Ring-style effect did the best job of feeling like it was imprisoning the creature. Break it open—much like Thalia broke open the Helvault—and the creature returns to the battlefield.