u/Inevitable-Raise-749

I was watching on youtube on decks about muddle the ever-changing then I encountered one cool interaction with muddle and silent hallcreeper found in this This Otter Copies Your Best Creature… Then Multiplies It | Muddle EDH @ 25:02.

In the video, it shows the myriad tokens of muddle(silenthallcreeper copy atm), upon damage will lose its myriad delayed trigger(exile at the end of combat) when they copied muddle.

I wanted to do this on my new deck but can't seem to find specific ruling on this situation as I need to explain it to my pod and we just started playing magic and need to show a specific ruling for this.