If another sac outlet arose that did something comparably useful to this then you couldn't benefit from both at once
Some of the things Vivien can set up are: Aurelia, the Warleader & Delina, Wild Mage Purphoros, God of the Forge & Saffi Eriksdotter Temur Sabertooth & Dockside Extortionist Loyal Retainers & Saffi Eriksdotter Pathbreaker Ibex & Urabrask, the Hidden Rionya & Combat Celebrant Avacyn, Angel of Hope & Serras Emissary Bruna & Gisela to build Brisela Thats honestly just scratching the surface
There is still a window to use instant removal effects prior to the equip so it is not completely effective protection but it is a good help
Magic: The Gathering Curses might restrict an opponent's options, deal damage over time, or encourage other players to harm the cursed player
That said, if your opponent drops something like a Blightsteel Colossus which can be hard to remove, you have the option of hitting it with this, though you risk them pulling out another powerful artifact in its place
Cards featuring iconic Pokmon such as Pikachu, Mew, and Mewtwo are expected to appear under this rarity tier