I'll be honest with you guys. I can't for the life of me understand why people have such a hard on for
Drake Haven.
3cmc do nothing enchantment, that requires you to be playing discard/cycle, and requires you to pay to activate it.
It's def not a card you can put in many types of decks. But in the type of Grixis or Dimir (or maaaybe Jeskai, but that's prob the worst of the options and the last one I'd try) filtering/recurring/madness decks I'm thinking it will be fine at worst and amazeballs at best. There are so many discard generators that activate in the range of
-
mana (baby Jace, Cathartic Reunion, Haunted Dead, Olivia's Dragoon, Smuggler's Copter, Key to the City, etc), that by T4 you can be jamming out 1-2 drakes without much trouble while doing what your deck normally does anyways. Those decks aren't aggro, they grind out value working towards eventually winning the resource war by recurring cards, so starting the drake party T4 is fine. Then later you can get really stupid with wheel effects from Chandra or even Collective Defiance (tho more expensive to high profit from). The madness cards those decks run are cheap too, so by T4 you can be Cathartic Reunioning out a land + Fiery Temper, converting the land into a 2/2 flying Drake while madnessing Temper. Turning your non-madness cards into additional profit alone is good. Not only are you gaining more profit from filtering extra lands, you're getting gravy on your recurrable creature discards (Prized Amalgams, Haunted Dead, Scrapheap, Dread Wanderer).
I've played quite a bit with a few versions of that type of Grixis shell the past few seasons. Drake Haven is a "build around rare", but its build already exists and is pretty solid without it. It doesn't need to get drawn for the deck to do its thing, but conviently the thing it's doing will help you find it quicker than other "build around rares". I feel pretty confident that this is a card that can take them from being pretty solid to very competitive.
As far as doing something Jeskai and pairing Anointed Procession with Drake Haven - that deck prob wouldn't be very good. Thinking back when I was playing a bunch w/ Wintervoid's Inevitability, that deck had enough wheeling/discarding that Drake Haven
could go in and do
something, but it really only gains Nihiri for trying that, and loses Haunted Dead plus the graveyard recursion side profit, so it will be more JFF just to combo AP for the drake storm when it works 1 game out of 20. Grixis/Dimir will be serious tho. Grixis is serious already and this is a seemless fit. Dimir doesn't really exist yet, but it could pop up.
TL;DR - it's narrow in the types of decks that can use it. But so are zombie lords, and peeps are gasses for those. Unlike zombie lords, decks that can use it already exist and are good (T2 good at least, maybe this is a piece that can push them to the next tier).