This is a card that screams long-term casual value, though the speculative constructed inflation is surprising. The only time that Risen Executioner has seen constructed play this far has been in creature-light decks intent on using the recursive ability rather than the caring at all about being a zombie lord. Frankly, Risen Executioner is much more impressive in this role.
A four mana lord just isn’t a great aggressive tool in 2016. If all we’re doing is curving small zombies into Executioner, then I don’t have much confidence in our deck. Sure, there are some neat recursive tools which can matter a lot against control decks, though what matters in creature decks is efficiency. If there were a sorcery that made two 2/2 zombies for three mana that might change my mind, but simply theory-crafting with what is known and what is actually expected I don’t see Risen Executioner maintaining its new price for long.
I still like the card as a long-term position, though if you’re able to get $3+ for them now I think you’ll easily be able to sell and re-buy later at a profit. If Risen Executioner does end up seeing significant Standard player, then it stands to at least double again, though I am quite confident as of now that this is extremely unlikely to happen. The zombie deck would definitely need to be defined by what’s on its curve below four, and while Relentless Dead is exciting it is exciting independent of being a zombie.