Temporary Copy Becomes A Copy Of Something Else

Suppose I have [[Niko, Light of Hope]], [[Silent Hallcreeper]] and some other creature in play, as well as 1 shard token from Niko.

I activate Niko's second ability, targeting Silent Hallcreeper, which exiles the Hallcreeper and turns the shard into a copy of the Hallcreeper. Then I move to combat and attack with the copy. Upon combat damage I choose Hallcreeper copy's 3rd mode, having it become a copy of another creature I control.

My question is, will the copy revert to being a shard on my end step, or does this somehow circumvent that delayed trigger. Thanks!