One of my standard decks is a 4-Color Rites deck. It has a few combos where infinite "dies" triggers are used. One of them involves having a Catacomb Sifter in play with a Brood Monitor and an Eldrazi Displacer.
The combo involves sacrificing the 3 scions created by the Brood Monitor, which creates 3 "scry 1" triggers from the Catacomb Sifter and adds 3 colorless mana to your pool. The mana just created then is used to activate the Eldrazi Displacer's ability to flicker the Brood Monitor. The Brood Monitor then enters the battlefield and it's triggered ability causes it to create 3 new Eldrazi Scions. This can be repeated infinitely, creating an infinite number of scry 1 triggers.
At regular REL events like FNM, I describe this to my opponents and ask if I can just cut to the card I'm looking for as long as I keep my deck in order. At competitive REL events would this be an appropriate shortcut to propose?
Another question: if the infinite triggers were scry 2 or more, then could you stack your deck as well? Are you allowed to just grab your deck and cut/stack it as a shortcut or is that not an appropriate shortcut for all RELs?