It was built by the Witch of Lochmere. Most of the wishes it grants are its own.

Foundations Jumpstart

Witching Well

When Witching Well enters, scry 2. (Look at the top two cards of your library, then put any number of them on the bottom and the rest on top in any order.)
{3}{U}, Sacrifice Witching Well: Draw two cards.

When this artifact enters, scry 2. (Look at the top two cards of your library, then put any number of them on the bottom and the rest on top in any order.)
{3}{U}, Sacrifice this artifact: Draw two cards.

The List

Commander Masters

When Witching Well enters the battlefield, scry 2.
{3}{U}, Sacrifice Witching Well: Draw two cards.