Eradicate

A face-down creature has no name, so no card can possibly share a name with it (not even other cards with no name). If you Eradicate a face-down creature you will still search its controller’s library, but you won’t be able to exile any cards from that library.

Wotc — May 01, 2012

If you manage to turn a land (such as a Forest or Stalking Stones) into a creature, you can indeed use this effect on that basic land type. Eradicate’s exile effect only looks for cards by name, not type.

Wotc — February 01, 2005

The copies must be found if they are in publicly viewable zones. Finding copies while searching private zones is optional.

Wotc — February 01, 2005

Use the name of the card as it leaves the battlefield.

Wotc — October 04, 2004

If a copy card is targeted by this effect, you get to look for another copy of the card it is copying. This is because a copy card actually takes on the name and initial characteristics of what it copies.

Wotc — October 04, 2004

Does not exile other cards of the same name that are on the battlefield. Just from the graveyard, hand, and library.

Wotc — October 04, 2004