The real value of this comes from the backside, as the dragon is a 4 power dragon, which triggers ferocious effects, and grants 2 additional damage for each dragon you control that attacks
It's other purpose is being the low scale for your pendulum summons and it also can be used as a backrow removal by destroying a other D/D card or dark contract you control which comes up in most of the combo lines
On top of that, Narset gives all your creatures prowess, so every spell you cast makes your team hit harder, meaning you can chain removal, card draw, or even extra combat spells right out of the graveyard while buffing your board
This also doesnt happen all at once, but rather one Energy at a time
As a unique Indestructible mana rock with an extra trick up its sleeve, this is the one card to pay attention to