Oracle

Scheme 

When you set this scheme in motion, target opponent chooses a creature you don't control and puts it on top of its owner's library, then repeats this process for an artifact, an enchantment, and a land. Then the owner of each permanent chosen this way shuffles their library.

NederMagic FAQ

Vraag: Hoe werkt een Scheme? Wat moet ik ermee?
Antwoord: Archenemy is een alternatief formaat dat Schemes gebruikt. Alle details kun je hier vinden.

Officiele rulings

6/15/2010
The targeted opponent may choose a creature they control, or may choose a creature one of your other opponents controls. The same is true for each of the other permanent types listed.

6/15/2010
The four permanents are put on top of their owners’ libraries in sequence. That means that a single artifact creature, for example, can’t be chosen as both the creature and as the artifact.

6/15/2010
If there are no applicable choices for one of the permanent types, it’s simply skipped. The process is still repeated for the other listed permanent types.

6/15/2010
If a player owns multiple permanents chosen this way, that player shuffles their library just once.

6/15/2010
The owner of a token permanent chosen this way still shuffles their library, even though the token ceases to exist.

6/15/2010
If one of the chosen permanents is controlled by an opponent but owned by you, you’ll wind up shuffling your library.

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