Causing players to turn one of their non-island lands into an island each turn in the form of flood counters, Quicksilver Fountain enables your merfolk with islandwalk across the entire board while also slowly interfering with the mana of any of your opponents who aren't playing blue
Our main conceit was that the main characters had a flying ship, the Weatherlight , and traveled from plane to plane going on various adventures
As a source of exactly 1 damage that pays you off for your opponents creature deaths, theres all kinds of potential
Its a fixed Winota in many ways
Jund, Abzan, Grixis, Four-Color Shadow, and a number of underdog decks can also make great use of this enchantment as a way to keep the pressure on through multiple copies of Fatal Push, Path to Exile, Supreme Verdict, and the like
It could also be something I would consider a big bad legend