Hello there ! (Yeah, I'm Kenobi)
Here is an idea for an entire poison synergy deck in standard format.
I don't know how this deck is powerful, but I'm really sure it's playable (good removal, easy wincon, good staples...)
The goal is to detroy your opponent with the poison rule = 10 counters on your opponent and he dies in a poison smog.
You must target your own creature everytime, and make as more as possible poison counters with the Priest.
For this aim goal :
-Your main friend is this famous priest Venerated Rotedpriest, because he can be targeted with Auras, tricks, ennemies interactions and your own removal/debuffs.
But the best thing is that this powerfull creature trigger on every "targeted creature on your board".
-The rest of the Toxic cratures is there to maintain the main poison strategy (exactly the same for proliferate cards).
Blightbelly Rat is a really cool R2 creatures, and when your opponent has some poison counter, he don't want to remove it from the battlefield, and prefer to exiles it, really cool "removal umbrela" for only 2 mana.
Bloated Contaminator -> all is on the card. Incredible body (WHY ?! That's too much text for a simple card), toxic and proliferate with TRAMPLE !
Vraska, Betrayal's Sting is a banger in the deck, because of her CA (phyrexian arena + proliferate), removal (Shoeldred ? Elesh Norn ?...) and potentialy the late-game wincon.
-Gix, Yawgmoth Praetor is just the vest CA card for Golgari, no ? Maybe change with Glissa Sunslayer after tests.
Targeting spells :
-Tamiyo's Safekeeping to protect your Priests, Vraska and Archfiend (from oil counter removal), and earn some HP, that's important in this deck (painlands/Vraska)
-Whisper of the Dross it's an instant as a removal for low CCM creature, or just to debuff a card that is fighting against a Bloated Contaminator. But additionnally you can target your own creature with a priest on the battlefield = 2 poison counter at the same time, why not ?
-Necrogen Communion is a utility aura for an aggressive purpose, you can attach it to your Contaminator, or your Archfiend and it's a banger. You can have 2 trigger from Toxicity, so you're priests, contaminator or rats are Toxic 3 ! You nobody wants that your rats die, and it's over if you can resurect it ! (proliferate twice with a single card toxic 3 rat little rat, really good dissuasive strategy).
-Audacity can trigger your priest or make some extra damage with trample for toxicity triggers
"WHAT ! A Boated Contaminator 6/4 Toxic 3 + trample and "undying" drAwInG ENGINE THAT PROLIFERATES in the same attack ?!"
The rest of the deck is some removals cards that work perfectly with the synergy.
I don't need to explain the lands I think, the main adding from All Will Be One is The Seedcore. It's a banger in this deck because all your creatures are Phyrexians, but there is no 1/1 (you can use Whisper of the Dross on your Blightbelly Rat is you'e desesperate or if you're free-board, but that's not a good idea in my opinion.
The deck can't be the target of Lesh Norn, or something bigger, so it's a good argument for me ;)
You can win a lot of game if you control 2 priests, because they trigger too much. This deck is really ok in the ladder, but you maybe need more CA cards, or anti-counter cards, some white cards ?
I'm open to all your ideas. But, try it, upvote and deckcycle it if you like it !
