He costs four ink to play and is an inkable card
Command Tower Everything good about Mana Confluence and City of Brass is the same about Command Tower, with the added benefit that it doesnt cost you anything
If your deck has some number of fetchlands like Misty Rainforest, Evolving Wilds, Myriad Landscape, or Blighted Woodland, you should strongly consider Erinis for your deck
There and Back Again: Jund Sarkhan has homes on both Tarkir and Jundand I figured it would only be fitting to close on a Jund deck that uses a bunch of Tarkir Dragons
We as Magic players have gotten so used doubling our creature tokens in the past couple years that WotC knew another doubler wasn't good enough, so they triple downed on the effect with this one
The answer is a bit multi-faceted, but in simple terms: the addition of Alchemy - while a valiant experiment - ended kind of badly