Rusting Giant

Indestructible, reach, Rusting (Creatures with
rusting take damage in the form of -1/-1 counters)
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"No one knows who could have created such a
towering metal beast. However, the same mystery
that is it's creation will one day be it's downfall. For
as no one knows who created it, so also no one knows
how to repair it."
-Dr. Ba'l Ghazi, Archeologist.