The Wandering Blade

Equipped creature gets +2/+0 and has wither, skulk,
and "At the beginning of your end step, put a -1/-1
counter on this creature."
At the beginning of each end step, if The Wandering
Blade is not attached to a creature, attach it to target
creature with the lowest power or tied for lowest power
among creatures on the battlefield.
"A thousand hands, a thousand cuts."
-Imyet assassin's mantra