WW – 2/2, First strike, protection from black borders (Nothing with a black border can block, target, deal damage to, or attach to this creature.)
The Tiny-Name Nemesis. How do you contain that kind of power in a peasant cube? Queue up the Silver Borders. Unstable brought us a hard to kill and even harder to block cyborg knight.

What beats it?
Countermagic, edicts or -2/-2 board wipes are the simplest answers.
Yeah, but what else?
White, Silver & Gold borders circumvent the protection. Acrylic alters, cards in Alter Sleeves, full/extended arts and special promos such as Invocations or Mystical Archives.
Tokens? Lands?
All tokens are black bordered unless created by a silver bordered card such as Crow Storm creating Storm Crow tokens. All basic lands are black bordered regardless of physical appearance. Nonbasic lands are dependent upon physical appearance.