Sim, o Um Anel ou o Anel de Poder controla os outros toques.
Three Rings for the Elven-kings under the sky, Seven for the Dwarf-lords in their halls of stone, Nine for Mortal Men doomed to die, One for the Dark Lord on his dark throne In the Land of Mordor where the Shadows lie. One Ring to rule them all, One Ring to find them, One Ring to bring them all and in the darkness bind them In the Land of Mordor where the Shadows lie."
—J.R.R. Tolkien's epigraph to The Lord of The Rings
No entanto, sua menção aos três anéis élficos está incorreta.
The greatest three Rings Celebrimbor crafted alone. So Sauron took no part in their crafting. He had no opportunity to corrupt them and turn them evil.
Wikia novamente:
The Three that remained to the Elves were carefully hidden from Sauron. They were not created as weapons of war or as a means to dominate others; their purpose was to preserve the beautiful Elven domains where their wielders resided, and to aid in healing and resisting evil. However, they were still linked to the One Ring, and whoever wore it could, with effort, see the thoughts of those who wore the Three.
Então, no máximo, Sauron poderia ter lido os pensamentos dos elfos (e Gandalf) usando os três anéis, mas nada mais.
Mas ele não poderia transformá-los em aparições ou controlá-los.