Depending on their budget and available space, Players can usually benefit from organizing their collection by Ink Colour instead of by Set
Two other nice-to-have cards are Trouble in PairsTrouble in Pairs and Greymond, Avacyn's StalwartGreymond, Avacyn's Stalwart
This blue instant also counters artifacts, Karn, etc., and also fizzles lots of stuff while replicating into Ashling triggers, which allows an Izzet deck to be pesky while converting into while rummaging/drawing three cards and dishing out a one-sided Pyroclasm
While other Rings of Power were forged for Elven-kings, Dwarf-lords, and the Mortal Men of Middle-earth, there is only one that matters most: the One Ring to rule them all
It's not like the package is bad in the format
Poison the Waters ought to be an excellent sideboard card, and its probably good enough to make the main deck in more controlling black decks