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Exile target creature and all other creatures its controller controls with the same name as that creature. That player investigates for each nontoken creature exiled this way.
Unless a token is a copy of another permanent or was explicitly given a name by the effect that created it, its name is the subtypes it was given when it was created plus the word "Token." For example, if an effect creates a 1/1 Soldier creature token, that token is named "Soldier Token."
A face-down creature, such as one cast with a megamorph ability from the Dragons of Tarkir set, has no name and can't share a name with any other creatures.
Declaration in Stone has only one target. The other creatures with that name aren't targeted. For example, a creature with hexproof will be exiled if it has the same name as the target creature.
If the target creature is an illegal target when Declaration in Stone tries to resolve, it won't resolve and none of its effects will happen. No creatures will be exiled, including those with the same name as the target.
If you sacrifice a Clue for another card's cost or effect, such as that of Angelic Purge or Tamiyo's Journal, you can't also pay {2} and sacrifice it to draw a card.
It's possible to have a creature and a noncreature permanent with the same name, such as two copies of the same land, one of which has become a land creature. Only creatures with that name are exiled by Declaration in Stone.
The token is named Clue Token and has the artifact subtype Clue. Clue isn't a creature type.
The tokens are normal artifacts. For example, they can be sacrificed to cast Angelic Purge or targeted by Root Out.
