Invasion of Lorwyn // Winnowing Forces

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, destroy target non-Elf creature an opponent controls with power X or less, where X is the number of lands you control.

Winnowing Forces's power and toughness are each equal to the number of lands you control.

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The Phyrexian appearance was so offensive that perfects and eyeblights worked together in unprecedented kinship to destroy them.