A step in one direction is two steps away from another.

The Brothers' War Retro Artifacts

Mesmeric Orb

Whenever a permanent becomes untapped, that permanent's controller mills a card.

"I now believe the strange orb was some kind of Thran security device. Supporting this theory, I can no longer recall where I found it."
—Tocasia, journal entry

Double Masters

Whenever a permanent becomes untapped, that permanent's controller mills a card. (They put the top card of their library into their graveyard.)

Salvat 2005

Mirrodin

Whenever a permanent becomes untapped, that permanent's controller puts the top card of his or her library into his or her graveyard.