Confusion dans les rangs (FR Confusion in the Ranks)

Enchantement    (CMC:5)

À chaque fois qu'un artefact, qu'une créature ou qu'un enchantement arrive en jeu, son contrôleur choisit un permanent ciblé contrôlé par un autre joueur qui partage un type avec lui. Échangez alors le contrôle de ces permanents.

87 MRD • FRRon 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.