IMO this is in vacuum the best death knight of them all. It's the second cheapest but the hero power is arguably the strongest of them all. It's basically life tap but you're getting an infinite supply of flexible and potentially broken minions. You can also get it earlier in the game than other death knights and you get consecration and iron hide as a bonus. Just imagine if this was a warrior, paladin or shaman death knight, it would be incredibly broken, that's how good it is. Unfortunately, now we must wait and see if this can be viable with the current hunter tools and if it's not, if we'll some some better ones with further expansions. Side note: Tracking is incredible for digging for this card.
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This card really helps hunter alleviate the lack of card draw. If a game is still going past turn 6 hunter is running out of steam. This hero power gives hunter a value play literally every turn after the DK comes out.