You’d leave the Devastator alive on board and mechathun’s deathrattle wouldn’t go off

Seems ok. It can be drawn with Crystology, so If a slow paladin sees play I wouldn’t be surprised if it gets added. It reminds me of Astral Tiger for Druids which hasn’t seen almost any play except out of a greedy N’Zoth deck. In my preliminary opinion, the only way for this card to be impactful is for it to gain taunt either through Spikeridge Steed, Bonemare or even Defender of Argus. Even then, It really all depends on how popular silence will be when the card is released.