With the correct setups and deck construction, this can often allow Glissa decks to return numerous artifacts from the graveyard in a single turn rather than the more restricted approach found in the aforementioned Emry
High Tide Extra turns are good, but extra mana is better
Umbral Collar Zealot has the potential to unlock an aristorcrats style deck that can pressure on multiple dimensions, one of them being attacking, while the aristocrats plan is being set up
Cards that see heavy play in Commander or have unique artwork tend to be the priciest
This is undoubtedly a powerful card with a ton of value, even when it's defeated, so expect to see a lot of it in play from Emerald & Sapphire players
With its disguise ability, you get to exile a bunch of other creatures from the battlefield and graveyard, both yours and your opponent's stuff