Theyre designed purely as novelty items and display pieces for your collection
Back when the Magic 30th Anniversary set was released, for example, Earthbinds artwork was altered during its reprinting for similar reasons
For example, in the fake Wartortle, the Pokmons name is spelled incorrectly as Wartortleh, the word flip is spelled filp, and the word turn is spelled trun
This instant essentially locks in your progress and shields your biggest threats, keeping your engine humming along
So, if you're planning on killing an attacking creature anyway, and you don't think your opponent has a way to counter it, then you should wait until the last moment in order to potentially draw out a (useless) trick