This looks like a RotBB list if I ever saw one.
It looks quite good but there is some problems
-3 Amplification: Rarely ever is useful.
-3 Cryptographer: If playing Decimus.
-2 Drogon: If playing Decimus.
-2 Entropic Gaze: Too costly for what it does.
-2/3 Elucidator: The combo with thumping is just too expensive.
-3 Rancour: It may be the flavour of the deck, but as you said it won’t last a turn, replace it with Young Silithar.
The most important card to add here is sunsreel defender this card is just insane when flashed out on turn 2 and helps you keep board and brings removal to it like a moth to a flame. Instant 3 of, no buts.
+3 Lavaslasher: You’re playing Vaath.
+1 Drogon: This is your finisher.
+3 Thunderhorn: This is the main card of the meta, it’s really good.
+2/3 Terradon: He be big.
+3 Decimus: You’re playing spikes after all.
Of course you don’t have to do these, but do your self a favour and put in 3x Sunsreel Defender