Once you've cast Henzie twice, Magus of the Order turns into a GGGcc creature search that puts any creature onto the battlefield, then you draw a card!  And then it becomes a priority recursion target.

Ebondeath Dracolith is an interesting card in here... when blitzed in it doesn't provide an attack or block, but if Henzie has been cast twice it'll provide a card draw on each player's turn for two black mana, with the bonus of being a sac target if you have a good outlet in play.  It requires you to keep black mana sources available, but if you have it, that can be a lot of extra card draw (especially if you need it).  And since it'll just sit in your grave, it's always available until it gets exiled.  And cast it normal the first time if you draw it early in the game and low on lands overall.  Or blitz it and get the wheels turning.  In my eyes this card is 80% card draw value for the deck, and 20% creature-in-play value (mostly for sacrificing).

Greater Good can feel a little scary in the wrong deck, but this deck should be built to access the grave easily and often, making those three discarded cards easier to handle, especially if you're far enough into the game that your blitz draws are putting excess land into your hand.  Using Greater Good will let you see cards faster, and some of those cards will then get a ton of your grave back into your hand or into play.

Unleash the Inferno doesn't have any deck synergy other than its jund colors, but realize that this can take out most commanders and their owner's Sol Ring/Mana Crypt/etc... think about the impact that can have on someone who relies on their general to make their deck run...... it'll cost 2cc more to cast it the next time, and you just reduced their ability to cast it by 2cc as well... that's a 4cc swing in their ability to re-cast it.

Danse Macabre is effectively a creature flicker, for either blitzed-in creatures or any other with an ETB trigger, and if you force your opponent to sacrifice something better, then you can get that... or maybe get both if you're lucky.  It's a little clunky at 5cc, but the card advantage is worth it, especially if you get to bring back two creatures.  And this benefits you to pick a higher cost creature to sacrifice, in terms of the value you're getting out of the spell.  It's at least worth considering throwing in, but it might be on the wrong side of the bubble.