Decided to add a Godless Shrine to the land base so I can add Stony Silence and Apostle's Blessing to the sideboard. Also, added Tombstalker to the main board. With how many 1-2 cmc instants and sorceries I'm running, delve made sense. Made a couple other changes to the sideboard to help shore up some weaknesses.

I'm debating getting rid of Beseech the Queen and Goldnight Castigator, but I have no idea what to sub in. Thought about Goblin Dark-Dwellers for the Castigator, but I wasn't sure about Beseech. Yes, it's a decent tutor, but I always end up feeling like I wasted my turn if I have to use it to find Heartless Summoning.

If you're only searching heartless with it, Shred Memory will serve as graveyard hate and an instant speed replacement for beseech. It'll also let you tutor apostles, stony and charm. Entomber Exarch could provide some cute recursion and hand control, Kalitas, Traitor of Ghet is broken, Korlash, Heir to Blackblade is ok, Mindslicer is hella threatening, Faceless Butcher provides targeted removal, and etb shenanigains. On the redder end Stormbreath Dragon dodges a lot of removal atm. Blood Baron of Vizkopa provides lifelink and all the relevant protections

@lagotripha Those are great. I think I will try out Shred Memory for sure, but will need to play around with the others to decide who will replace Castigator. Thanks!!

Sire Of Insanity Could be really dumb alongside Avaricious Dragon

Rakdos the Defiler could be disgusting

Thundermaw Hellkite for turn 3 beats

Urabrask the Hidden For speedy bros and blocker removal

DUDE

Lupine Prototype

This guy is like myr superion but slightly worse. He is made better if you add another avaricious dragon for discard, and maybe Delirium Skeins

Gutsy... I LIKE IT!

Thank you!:P I tried making a version of this idea, except with artifact creatures that cost 2 like Scrapheap Scrounger so I could dump my hand easier for lupine prototype, and then Chief of the Foundry to buff them all up.

Here's my list

And here's another one that uses heartless summoning as just a utility card, but the deck looks more like a long range birthing pod deck with panharmonicon, thragtusk, etc. However, this one is a work in progress.

However, I think your list is better than y artifact aggro one caue heartless summoning takes off too much power for it to be super good.

Taking a look at this what do you think about replacing Goldnight Castigator with Mogis, God of Slaughter and Purphoros, God of the Forge ? Heartless Summoning allows them in for 2 mana each and they can keep up the pressure in mid game when the deck might run out of steam. Also, Priest of Urabrask gives us lots of mana to play with from abusing the combination of it and HS, giving us 3 red mana from spending 1 red mana. Let me know what you think.

inspired! love it. Makes me want to make a deck like it

Why would you run an offcolor shock?

I like the idea of Urabrask as you can play him and if you happen to have the superions in hand he can let slot of damage get through and tap any creatures the opponents play next turn. Unfortunately he dies to bolt with summoning and path and dismember are always a problem

Cool deck. Have you ever thought about Ammit Eternal? Its already a great card but with Heartless Summoning it is a 4-4 with afflict 3 for just one black. Seems worth it to me.

Simian Spirit Guide doesn't let you cast Myr Superion however (according to the gatherer), even if the other trick works. In any event this makes me want to build a Master of the Feast, Desecration Demon, Abyssal Persecutor deck using Bad Moon and Heartless Summoning. Throw in some Grey Merchant of Asphodel for a little devotion aspect and we have a fun deck.

Spirit Guide is there for turn 1 Heartless Summoning and spare beaters later on. It can help get Inferno Titan out T3, or Thundermaw Hellkite T2. I never thought to try it for Superion, but thanks for the ruling so I don't make that error.

How quickly are you empty-handed? Would Lupine Prototype be a good addition? OH! Stormbreath Dragon can be played turn two WITHOUT needing two Spirit Guides to do it. Turn one Summonings with the help of one Spirit Guide, turn two Stormbreath.

Forget the part about Stormbreath. I'm so used to Skred players playing him turn four with the help of mana rocks that I mistakenly remembered his mana cost as being 2RR.