Dimension Jar

 This card is the first Machine-Type Flip monster.

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This monster appears to be an opened tesseract or hypercube, the four-dimensional form of a cube.

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OCG Rulings

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The monster effect of "Dimension Jar" always activates when "Dimension Jar" itself is flipped face-up. (It activates even during the Damage Step.): Dimension Jar

The monster effect of "Dimension Jar" does not target. When the effect resolves, each player can choose up to 3 cards from their own opponent's Graveyard and banish them. (They can choose not to banish any cards.)

The turn player chooses the cards to be banished by the monster effect of "Dimension Jar

Previously Official Rulings

This card should say "FLIP: Both players can remove from play up to 3 cards from their opponent's Graveyard.", not "up to 3 monsters".

You can use "Dimension Jar's" effect for zero to three cards, so even if your opponent has less than 3 cards in his Graveyard you can still use "Dimension Jar's" effect.

When "Kycoo the Ghost Destroyer" is on the field and "Dimension Jar" is activated, the controller of "Kycoo the Ghost Destroyer" can remove their opponent's cards in the Graveyard from play.