Mycosynth Fiend

Combos Browse all Suggest


Format Legality
1v1 Commander Legal
Archenemy Legal
Block Constructed Legal
Canadian Highlander Legal
Casual Legal
Commander / EDH Legal
Commander: Rule 0 Legal
Custom Legal
Duel Commander Legal
Highlander Legal
Legacy Legal
Leviathan Legal
Limited Legal
Modern Legal
Oathbreaker Legal
Planechase Legal
Quest Magic Legal
Tiny Leaders Legal
Vanguard Legal
Vintage Legal

Mycosynth Fiend

Creature — Phyrexian Horror

Mycosynth Fiend gets +1/+1 for each poison counter your opponents have.

TheoryCrafter on Has Toxic fixed poison counters?

1 year ago

I don't really see poison fully fixed until:

-The ten poison counter state based rule is phased out with a spell and ability system that punishes players with poison counters (All Will Be One, Mycosynth Fiend, and the Corrupted ability are a start) and cards including, but not limited to, Crypt Cobra and Pit Scorpion are treated like alternate win cards.


-The one I prefer, WOTC breaks down and prints more cards like Leeches, Melira, the Living Cure, Melira, Sylvok Outcast and Solemnity where poison counters can be removed or restricted.

Mortlocke on New hubs to be added

2 years ago

Hello legendofa,

I propose a new hub to be added: Phyrexian. During Modern Horizons 2, 225 creatures were retconned into having the Phyrexian creature subtype to join Vorinclex, Monstrous Raider . Additionally, there were a smattering of Enchantments, Artifacts and etc that ether have the Phyrexian subtype or create creature tokens that do. Thanks to this retcon I now have a deck that has a Phyrexian tribal theme. For your reference, below is a full list of spells that were affected by WotC's Phyrexian errata.


greatdevourer on This Machine Kills Tyrants

5 years ago

OK, consider the following changes. Obviously you'll need to consider the budget you want to keep with this deck. I'm looking at options to bring up the kill speed for this deck. If you really want to hit hard and hit fast, then you need not worry about you own life total early in the game. I know what you're going for in this deck and I think you should look at this dekc from a different perspective. I'm not talking about play styles. I'm working with your aggressive beatdown style. I'm talking about shifting strategies in mid-game. In the early game you go all-out and hit as hard and fast as possible. Get the kill by turn 4 or 5. Once you've taken out the primary threat, you shift strategies. Change your approach and work on recovery and defense, shift to a midrange gameplay.

Ditch that crappy Putrefax. The "sacrifice at the end step" is too much of a hinderance for 5 mana. It it were cheaper, maybe, but nope it is just crap.
I really like Elesh Norn, Grand Cenobite but the mana cost is too high for the early game. Not sure on this one.
I also think you should reconsider keeping the Lost Leonin since he's cheap and hits the field early. He's also a great pump target.

Better infect creatures:
Contagious Nim
Ichorclaw Myr
Mycosynth Fiend
Phyrexian Digester
Relic Putrescence - screw your mana rock.
Skithiryx, the Blight Dragon
Whispering Specter

Pump for the kill:
Invigorate - Because we don't care what their life total is.
Tainted Strike - Surprise!
Snake Cult Initiation - 3 poison counters at once.
Glistening Oil
Giant Growth, Mutagenic Growth, Titanic Growth, Might of Old Krosa - The classic pump tactic.

Let's consider toolbox utility cards:
Azorius Guildmage - Because screw your activated ability. Counter a planeswalker ability and watch the looks on their face.
Simic Guildmage - Imagine moving the Rancor or Phyresis after blockers have been declared but before the damage phase.
Prowling Serpopard - Nope, I'm gonna get my creatures.
Melira, Sylvok Outcast - Make the game one-sided.
Lightning Greaves - An additional set of Swiftfoot Boots. Yeah, I know shroud means that you can't pump, but there are ways around that.
Unburial Rites - Here it comes again.
Virulent Wound - Poison and removal.
Pistus Strike - Poison and removal.

There are some -1/-1 counters decks based around Hapatra or Atraxa. Since the infect creatures deal combat damage as whither, we can use that to our advantage.
Hapatra, Vizier of Poisons - Put those -1 counters on opponent's creatures to work making tokens.
Phyrexian Hydra - This gets just stupid with Hapatra, Vizier of Poisons.

Lands you may have missed:
I know we've talked about this in the past, but I think you should really consider getting the shock lands. A quick check of the card prices on TCGPlayer puts the shocks at about @10-15 each. Totally worth it.
Gavony Township - Proliferate!
Vault of the Archangel - Need to stay in the game a bit longer.
Boseiju, Who Shelters All - Screw your counterspell.

MollyMab on Infectious Counters

6 years ago

So one of the issues is your win con is split between damage, and infect. You want to focus on one or the other. For example, dropping Mycosynth Fiend for something like Blight Mamba or Glistener Elf.

Goblinrunner on Corrupted Commander

7 years ago

I wrote a comment but clicked the wrong button. So short version now:First: Your Commanders ability to get the activated abilities of other creatures doesnt really fit into your deck.Second: Infect produces aggro, and you have a lot of it. Your deck makes it very clear, even if you dont play an infect creature, that you want to poison others. Examples: Corrupted Conscience, Trigon of Infestation, Decimator Web and Mycosynth Fiend. When they see you want to poison them they will set aside their quarrels and take you down firstThird: Sol Ring

Zatypoo2929 on Infect

7 years ago

ruinous path>Royal Assassin?

Melira doesn't really help you here, because it's you giving the poison.

Putrefax, Mycosynth Fiend, Spinebiter, Glistener Elf, Septic Rats?

you don't need 2 vraska, 1 vraska, 1 Garruk, Apex Predator?