Confusión en las filas (SP Confusion in the Ranks)

Encantamiento    (CMC:5)

Siempre que un artefacto, criatura o encantamiento entre en juego, su controlador elige el permanente objetivo que controle otro jugador y que comparta un tipo con él. Intercambia el control de esos permanentes.

87 MRD • SPRon Spencer

™ & © 1993—2003 Wizards of the Coast

Notes: TODO: Update Copyright

Legal in: Modern,Mirrodin Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Classic,Singleton 100,Commander

Oracle Text (click to copy):

Confusion in the Ranks {3}{R}{R} Enchantment Whenever an artifact, creature, or enchantment enters the battlefield, its controller chooses target permanent another player controls that shares a card type with it. Exchange control of those permanents.

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View this MTG card on Gatherer

10/4/2004
The exchange isn't optional. If there is a legal choice, you must make one. 
12/1/2004
The permanents have to share a permanent type both when the target is chosen and when the ability resolves.
12/1/2004
Even though Confusion in the Ranks triggers only when an artifact, creature, or enchantment enters the battlefield, the ability can target a land if the permanent entering the battlefield is an artifact land.
12/1/2004
The permanents are exchanged only if they're both on the battlefield when the ability resolves.
12/1/2004
Confusion in the Ranks triggers on itself entering the battlefield. If an opponent controls an enchantment, exchange Confusion in the Ranks for that enchantment.

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Card Confusion in the Ranks is not on TCGPlayer.