Neltharion, as we know, is the uncorrupted version of Deathwing before he was driven mad by the Old Gods, particularly N'zoth. Good synergy with N'zoth too as it is also a Deathrattle minion.
Flavor text: One of the chosen dragons of the Titans, it's such a shame he went evil, becoming the Aspect of Death over the Aspect of Earth.
Summon: The earth is under my protection!
Attack: I guard this land!
Death: Are my power and wisdom not enough?!
(So when he dies, it's like he 'becomes' Deathwing, destroying all minions upon entry, corrupted by the whispers and torments of N'zoth)
*Flames will devour the field upon Neltharion's death, similar to how a normal Deathwing is played from the hand.
Edit: Reworked effect; the combination isn't exactly that easy to pull off, and is quite slow, but if the Deathrattle pulls through, the effect is very rewarding.
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You need the hilt too