These cards use the frames and treatments found in their foil printings but without the foil treatment (such as Nexus of Fate above)
Its only weird because its not very typical for Magic, but its pretty natural once you do it
PLA is not intended to be left in a hot environment (like a car) for long periods of time
For example, cards with Proliferate can increase the amount of counters on them, while Vampire Hexmage, which removes all counters from a target permanent, grants an immediate transformation
Imagine the following scenario, one Im sure will occur before Linvala finishes her run in Standard: your red opponent has a few guys out and has wittled your life total down against your midrange or control deck
First, get Deceiver Exarch on the battlefield and then play Kiki-Jiki, Mirror Breaker targeting Exarch to create a copy of it