Flavor Text: Wardens consider Maiev Shadowsong as their role model, which is ironic since she had just one job to do and she failed it.
A strong tempo card for a Rogue. Something I wish the Kidnapper had been and I am assuming we will see a card like this at some point in the future. The card works like Frost Elemental with an additional mechanic that suits the Rogue class. Downside of the card is the minions can still provide threats with their abilities, for example Ragnaros the Firelord. In addition Warden is quite squeezy and easy to remove with almost any spell.
The mechanic strongly fits to the warcraft lore of how Wardens imprison and keep an eye on dangerous characters. :) I added a bigger lore section below for those who are interested:
The mysterious wardens serve as the night elves' special police force in Kalimdor. Set apart from the militant Sentinels, wardens are usually employed as jailors, assassins, and bounty hunters. When loosed upon escaped criminals, wardens employ a number of supernatural powers that enable them to recapture their prey and mete out the night elves' justice. Wardens have a line of sight teleport ability called "blink," which they can use to outmaneuver even the quickest of foes. The most famous warden is Maiev Shadowsong, the woman responsible for keeping the most dangerous prisoner in night elf history — Illidan Stormrage.