The lack of haste means Mishra needs to live, but Phyrexian Dragon Engine has Unearth, so you can get that on the field from grave with haste, swing in, and get the meld
Additionally, while The Queen's Castle only costs four ink to play, it will give two lore and has a defensive willpower of seven
It can't be the target of the triggered ability of Mystic Sanctuary
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Or maybe it's the silliness of being able to crew a large piece of machinery using any kind of creature, whether or not it has opposable thumbs, or even hands
And despite having a strong strength/will power combo, uninkable spots in your deck are few