Spectral Knight was added in the Curse of Naxxramas Adventure. He is available from Wing 3 - The Military Quarter which opened on August 5th, 2014, and is obtained after defeating the adventure boss Gothik the Harvester.
Adventure Guide
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4 mana just to remove his effect, his 4/6 body is still intact, if he is played turn 5 or 6(earlier with Innervate), it's still inefficient for the Priest that used Mass Dispel.
How would you get rid of this card if you're side of the board isn't developed? :/
Hunter's Deadly Shot.
Whirlwind / execute if Warrior
Alistorshame,
You can't target it with an owl I think, not too sure though never tried silencing a faerie dragon.
You can target Faiere with Owl, as you can target it with SI:7, for example, so I think obviously Spectral Knight can also be targeted by Owl.
doubt anyone will silence this there is better things to silence
An Owl is a minion. And it has a battlecry.