Scour can target and exile cards that aren’t always enchantments, but are enchantments when Scour is cast and resolves (such as creatures turned into enchantments by Soul Sculptor). Scour’s exile effect only looks for cards by name, not type.

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

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

Scour : règles, fonctionnement et interactions (MTG)

Scour is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Exile target enchantment. Search its controller's graveyard, hand, and library for all cards with the same name as that enchantment and exile them. Then that player shuffles.

How it works : Scour

Original English text — Wizards of the Coast / Scryfall

#1February 1, 2005· Wizards of the Coast
Scour can target and exile cards that aren’t always enchantments, but are enchantments when Scour is cast and resolves (such as creatures turned into enchantments by Soul Sculptor). Scour’s exile effect only looks for cards by name, not type.
No other card is named in this ruling.
#2February 1, 2005· Wizards of the Coast
The copies must be found if they are in publicly viewable zones. Finding copies while searching private zones is optional.
No other card is named in this ruling.
#3October 4, 2004· Wizards of the Coast
Does not exile other cards of the same name that are on the battlefield. Just from the graveyard, hand, and library.
No other card is named in this ruling.

Interactions with other cards

These cards' text mentions Scour.

Ardyn, the Usurper

Demons you control have menace, lifelink, and haste. Starscourge — At the beginning of combat on your turn, exile up to one target creature card from a graveyard. If you exiled a card this way, create a token that's a copy of that card, except it's a 5/5 black Demon.

Scouring Sands

Scouring Sands deals 1 damage to each creature your opponents control. Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Scourge of the Skyclaves

Kicker {4}{B} When you cast this spell, if it was kicked, each player loses half their life, rounded up. Scourge of the Skyclaves's power and toughness are each equal to 20 minus the highest life total among players.

Scour the Scene

When Scour the Scene enters, create a 2/2 white and blue Detective creature token. Whenever you sacrifice an artifact, choose a creature card in your hand or a creature you control. It perpetually gets +1/+0.