LogFAQs > #885982400

The argument is that when facing mage, you should be trying to play faster than them. "Dominating" means you have a pretty good board lead and have already whittled down their heath a fair bit by turn 9. The Jaina DK is a rather large tempo loss itself and takes 2-3 turns to regain the tempo even if you have things to ping. If you've been dominating then you should just be able to capitalize on this and lethal them over the next couple turns. The lifesteal is too slow to matter in this case. Meanwhile the DK just sits in your opponent's hand, useless until turn 9. Sure, in a value match-up the DK can just win, but then you probably weren't dominating in this sense. And since so many of the cards in this set reward having the board, that should always be your number 1 priority vs mage, not value, unless you have a specific type of deck, which will just be weak to the DK by its nature.

Like, you can have ten times the value in your deck, but if the numbers just don't work for you to avoid 1 health minions, you'll lose if you can't kill them within one or two turns. It's the single best carry card in the game.