Parasitosis, aka BUG Delirium, is a Sultai build I came up with that offers the total package of speed, control, and hard hitters to make life very unenjoyable for your opponent. Sultai isn't a commonly played color combo in modern, but I have been making waves with this deck in the current meta. What this deck offers over other GBx decks is diversity in playstyle, allowing it to adjust to almost any match up. You have the ability to play as the aggressor, or sit back and control the board. This deck is tempo in its truest form, giving you both sides of the spectrum to work with. It's a tough deck to pilot, but incredibly potent and satisfying once you've got it dialed. I've spent a great deal of time designing and refining this deck to its final form so please +1 Upvote if you like the build. If you have any questions or comments I'm an open book!

This deck plays sort of like a mixture between grixis delver and jund/abzan. Like all GBx decks, the name of the game is attrition. Your game plan is to utilize spells that are more powerful and more efficient than theirs, which will leave them empty handed with no board presence while you have a couple 7/8 Goyfs on the board. This deck functions on the rule of 4; 4 card types in the graveyard and 4 power on the board, both of which support one another. With 4 card types in the graveyard delirium will be active for both Grim Flayer and Traverse the Ulvenwald. This will also put the power of both Grim Flayer and Tarmogoyf at 4, which turns on Stubborn Denial.


The primary engine of this deck is undoubtedly Thought Scour. The graveyard acts as our second hand and primary resource, and this card fills your grave with a plethora of cards and card types of which all the creatures in this deck benefit from. Since the printing of Fatal Push, powerful creatures like Tarmogoyf and Grim Flayer have become much more vulnerable in Modern. In this Sultai shell you have the ability to make them threats quickly, and protect them efficiently with the almighty Stubborn Denial.

Fatal Push: The most powerful and efficient creature removal spell in B

Go for the Throat: Our version of Terminate, albeit not as good, yet good enough. Go for the Throat is the best 2 mana "catch-all" kill spell we have access to and is a necessary addition to the build. We don't care about artifacts because literally every other removal spell we run can kill the artifact creatures in Modern. This spell helps with opposing Tasigurs, Anglers, Eldrazi and Prime Time.

Grim Flayer: An important component to the functionality of this deck. He will almost always be a 4/4 with trample, which turns on Stubborn Denial and is a threat on its own, but he also offers card filtering which ensures we draw what we want and have the rest to utilize in the graveyard.

Inquisition of Kozilek: Intel and hand disruption provide a safer environment for our creatures.

Jace, Vryn's Prodigy  Flip: Another card that does exactly what this deck wants to be doing. His looting ability can help build the grave with the cards and card types you need, and once he flips you have a tank that can continually recycle spells in your graveyard. He's especially relevant since we're running LotV which means you're not always going to be able to hold up a Snapcaster Mage

Liliana of the Veil: An obvious choice in any deck that runs black. She is the queen of attrition and works well with our graveyard synergies.

Maelstrom Pulse: So diverse, so powerful

Mishra's Bauble: A Very important piece to the deck. It's a free cantrip, adds a card type to the graveyard, creates a revolt trigger for Fatal Push, and can help assist us with our Though Scour plays

Pulse of Murasa: Kind of like our version of Kolaghan's Command for this build. This slot was previously inhabited by Liliana, the Last Hope but it turns out the life gain is much more critical. Mana can be tight in this build so some games you may need to shock yourself a few times to get the right lands. Pulse provides excellent stabilization and returns a threat to hand at the same time.

Search for Azcanta  Flip: I was curious to try this card out in the build when Ixalan came out, and it ended up being the perfect addition to the build. Early game this card does exactly what this deck wants to be doing, giving us a pseudo scry and helping build our graveyard. Once it flips, it is an absolute powerhouse in the mid-late game, giving us card advantage and helping us cycle through the deck to find exactly the right pieces. Can't grab a creature but need one? No problem, grab Traverse the Ulvenwald. With this addition the deck now has 7 of the 8 card types incorporated in the deck, making for some truly tyrannical Goyfs.

Snapcaster Mage: The primary reason to run blue in a GBx build. Time and time again Snappy has proven his worth in the modern format as a powerful addition to any deck. Attrition doesn't hurt nearly as bad when you have the ability to recycle all of your spells. He's the reason this deck has such flexibility in playstyle.

Stubborn Denial: I've always been a fan of this card and it's finally starting to get some shine in Modern. The stipulations to make this card powerful are easily obtained in this deck, and it throws a huge wrench in your opponent's game plan. This is by no means a "counter control" deck, but a 1 mana Negate is a little too good to pass up

Tarmogoyf: Turn 2, a 5/6 for two mana...

Tasigur, the Golden Fang: Such a powerhouse in the modern format, especially after the printing of Fatal Push. He's castable on turn two with a Thought Scour in this deck, has a big body, dodges multiple removal spells, turns on Stubborn Denial, and provides card advantage.

Thought Scour: The primary engine of this deck that fuels our creatures and fills our second hand, aka our graveyard, with playable material.

Thoughtseize: Intel and hand disruption provide a safer environment for our creatures.

Traverse the Ulvenwald: This card is insane and I'm surprised it's still priced as low as it is.. In this deck it makes sure your mana is on curve, tutors a threat, or tutors a disruption or removal spell via Snapcaster Mage for 1 mana..


Abrupt Decay: Nice to have an extra for decks that run counters or annoying things like Blood Moon, Chalice of the Void, or Ensnaring Bridge

Collective Brutality: Shows it's strength time and time again in modern. Great against control and burn.

Disdainful Stroke: Primarily for Tron and Scapeshift

Engineered Explosives: Great against CoCo decks and go wide strategies

Feed the Clan: We can hurt ourselves a fair amount between Thoughtseize, fetching, and shocking. This ends up being a potential 20 extra life against the more aggressive builds

Flaying Tendrils: Death to weenies

Ghost Quarter: Tron has always been GBx decks greatest weakness. Let's not have it be

Maelstrom Pulse: Extra large/wide threat removal

Nihil Spellbomb: Self cycling grave nuke

Surgical Extraction: I mean what deck doesn't include this in their sideboard? Even more powerful in this deck with the hand removal and Thought Scours

Content coming soon!


Boggles: 1-1-1 (would have won the 3rd, ran out of time)

Rat Moon: 2-0

Esper Control: 2-0

Scapeshift: 1-2

UPDATES: Dropped the 2 Inquisition of Kozilek in favor of 2 Serum Visions


Storm: 2-0

Grixis Control: 0-2 (thankfully it's fringe, but basically unwinnable)

Bant Counters Company: 2-0

Jeskai Control: 2-0 (Slaughter Pact for the win XD, goddamn Stubborn Denial is good)

UPDATES: Dropped Hurkyl's Recall in favor of Thrun, the Last Troll in the Sideboard


Grixis Shadow: 2-0 (lolz)

Infect: 2-0 (lolz)

Scapeshift: 2-1

Goblins: 1-2 (Yikes! Could not find removal.. He went 4-0....)

UPDATES: Dropped Ashiok, Nightmare Weaver in favor of Feed the Clan in the Sideboard


Mono White Death & Taxes: 2-0

UW Control: 2-0 (Azcanta, the Sunken Ruin is pure gas omg)

Affinity: 2-0

Eldrazi Tron: 2-1

UPDATES: Heavy playtesting in the past week caused me to make a couple adjustments prior to this tournament. I decided to add the 4th Fatal Push, moving an Abrupt Decay to the sideboard. I dropped a Surgical Extraction in the side as it's my least used sideboard card and this deck cycles through itself very efficiently making 1 all that is needed. I also added the 4th Mishra's Bauble and dropped a Creeping Tar Pit. Bauble helps make this deck extremely consistent, and the single Tar Pit can easily be searched up with Traverse the Ulvenwald if needed. With the release of Ixalan I decided to try a single copy of Search for Azcanta  Flip by dropping a Liliana, the Last Hope. This card was extremely relevant in certain matches and I was thoroughly impressed with its performance in this deck. It's earned a permanent spot for now, putting the amount of card types in the deck up to 7. The deck performed extremely well and I ended up tying for first place :) No foreseeable adjustments needed to be made after this tournament.


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Date added 1 year
Last updated 1 month

This deck is Modern legal.

Cards 60
Avg. CMC 1.62
Tokens Jace
Folders Modern, modern, Crap I may build, Uncategorized
Top rank #41 on 2017-10-12
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Revision 58 See all

2 months ago)

-1 Jace, Vryn's Prodigy  Flip main
+1 Jace, Vryn's Prodigy  Flip main
+1 Search for Azcanta  Flip main
+1 Pulse of Murasa main
-1 Ghost Quarter main
+1 Swamp main
-1 Collective Brutality main
-1 Liliana, the Last Hope main
+1 Ghost Quarter side
-1 Flaying Tendrils side