In addition to supporting your artifacts, this construct benefits from cards like Vedalken Archmage and other cost reducers for a more streamlined play experience
Thats not to say you cant make a Boros self-mill deck I see you, Osgir players but the card pool in Sultai will probably rebuild better and outpace other colors trying to self-mill
Plot lets you store it away for a turn where you need it, keeping all your mana open for the spells you draw, and cashing in a stray land is a nice alternative to discarding a card as a cost
Final Fantasy will undoubtedly draw in a ton of new players who prioritize flavor over function, so in that sense, the card is a win
As a result, you'll look at the top four cards of your library, put up to one back on top, and exile the rest once for each Devour of Destiny you revealed
Meld doesnt see much play in any Constructed formats and it was generally pretty difficult to pull off in Draft