Battle of Geonosis

(As a Seige enters, choose an opponent to protect it. You and others can attack it. When it's defeated, exile it, then cast it transformed.)
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When Battle of Geonosis enters the battlefield, create one 2/2 Nexus creature token with haste, one 4/2 Reek creature token, one 5/1 Acklay creature token with double strike.