4 Mana for a 3/2, that might not even have that much influence on the current board-state, seems underwhelming at best.

The deck also seems to be missing a focused game plan, other than beating the current DTBs. Between the kind of awkwardly fitted Pernicious Deeds, Liliana and a bunch of good 2cc creatures, there isn’t an awful lot of synergy going on.

Perhaps a more aggressive version would be feasible in these colours, using lower casting costs to fully abuse Dark Confidant. Focusing more on putting pressure on the opponent while still retaining control elements such as Maelstrom Pulse and Punishing Fire for a decent mid- to  late game.

It seems a bit of a goodstuff.dec at the moment, but I do think a Jund Aggro-Control deck could be viable.

Adam Forsythe can say whatever he wants to about card design, but it’s pretty obvious Cavern of Souls was designed to affect every format in which it’s legal. The original article actual references this point twice.

I don’t play standard, so I have no opinions on the strength of “Devlerblade” compared to the strength of any potential deck which will run Cavern of Souls. I do know enough though, to know Cavern of Souls clearly nerfs the power of Snapcaster + Mana Leak.