Well give you a small recap with feedback below
The idea here is similar to Circle of Dreams DruidCircle of Dreams Druid: Attack, target The One RingThe One Ring with a bunch of triggers and then tap it in response to each one
At the top end, Aurora Dreaming Guardian takes advantage of the existing Aurora Regal Princess as a shift target and can Ward your important Characters to keep them safe from certain removal options
Its also a second functional copy of many key cards in a singleton deck, another data point that makes it the clear best sorcery-speed tutor in Magic
Sacrificing something for free absolutely falls into this camp, and Umbral Collar Zealot is of the most premium cards for any kind of sacrifice deck
So long as you can pull that off (not too difficult considering its dash ability, which well talk about later), youll get to create a Treasure token and exile the top card of your opponents library, which you can cast until end of turn