Magic the Gathering's world of Mirrodin may have been an artificial world of metal created by the Planeswalker Golem Karn, but it's best known for its eventual fall to the Phyrexians. A scourge that seeks to 'compleat' all living things in a horrific mish-mash of metal and flesh, they seep into new Planes with their poisonous oil. Once the Phyrexians are in a plane, their poison will grow and grow until the entire world has fallen to them.
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