Invasion of Xerex // Vertex Paladin

Set name - March of the Machine
(As a Siege enters, choose an opponent to protect it. You and others can attack it. When it's defeated, exile it, then cast it transformed.)
When this Siege enters, return up to one target creature to its owner's hand.

Flying
Vertex Paladin's power and toughness are each equal to the number of creatures you control.

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The literal-minded Phyrexians made the greatest mistake possible on Xerex: they tried to understand what they were seeing.