Hearthpwn

Got a source for that?

I'm not sure it works the way you described (at least about Malorne since the deathrattle puts the card in the deck, and Spirit Echo says that the card returns to the hand).

Weasel Tunneler makes sense, but without source it would be hard to say.

more over just sense. We have a card with the deathrattle (resummon this minion) and it resummon's it on your opponnent's side so most likely it would work the same way. 

Malorne on the other hand would be given two deathrattles. It's not changing sides or anything crazy so one copy would go to the deck and another would go to your hand. It's kind of like asking what would happen with narubian egg? would it go into your hand or would it summon a 4/4? well it would do both. 

So this helps two Quests - Shamans will be looking to play this on Murlocs, and Rogues will be looking for this from Burgle and Swashburglar. Neat design.

Rogues could also easily complete the quest with this when burgled.

Too bad Burgle is rotating out