The Nameless One

The Nameless One is a legendary priest minion card, from the Madness at the Darkmoon Faire set.

Strategy
The Nameless One's Battlecry effect, though unusual, can be potent in the right circumstances. It can be used against a Taunt minion that would prevent lethal on your opponent, huge buffed minions or ones with powerful effects that prove too much of a threat to ignore (eg. a 20/20 Edwin VanCleef, The Lich King, etc.), or even to "steal" said effects (such as with the Lich King, Malygos, Kalecgos, Y'Shaarj, Rage Unbound, etc.).

It can also be used against your own minions in certain cases. Using this on a minion with a downside (like Zombie Chow or Ancient Watcher, for instance) can allow you to bypass said downside for that minion, although remember that, since the Nameless One only silences its target, it will itself have those potentially negative effects.

Lore
The Nameless One is unique to Hearthstone.

Patch changes

 * Added.