This is the my first and main deck since starting playing mtg arena again. Looking at the new sets and was available to me I found that poison counters and proliferate had a lot of power. So I created a deck around that idea, at first I had a lot more creatures but there is obviously problem's with trying to rely on creatures to poison the player. I then tried adding more flying creatures with poison or creatures with corrupt that could fly and so on. Finally I settled with less creatures more proliferate and counters. For the most par this deck works on almost everyone I play against and as of this date 11/26/23 I have reached gold so far after only playing ranked for a few days with it.
Way to play is very simple, get one poison counter on the opponent as soon as possible, either with Prologue to Phyresis, Bilious Skulldweller, Voidwing Hybrid, Blightbelly Rat or Vraska's Fall. Any of these will work but the fastest are the Prologue and skulldweller. Once you have a poison counter just go ahead and proliferate till your hearts content. Thankfully blue has great proliferate cards than can counter and so on. As for the lands you could add extra shipwreck marsh if you have them.
If you are needing more life try getting out one or both of the Scheming Aspirant since you will gain 2 life and opponent loses 2 every time you proliferate while poisoning them. Lastly, if you get the voidwing out you can bring it back whenever you proliferate as long it is not exiled which makes it very useful.
In the sideboard I have a few other cards I used for a bit before switching to this build. Mesmerizing Dose is great because it not only proliferates but also ties down a creature that you might not be able to kill or have sacrificed (like if they have too many tokens on the board).
Honestly I want to splash in white especially for White Sun's Twilight since it can board wipe and create a good number of toxic tokens but have not figured out how I want to do it as of yet. Of course green toxic would be great too, but as of right now I do not have enough good green cards to play it the green toxic deck fast enough. When I do I might create a white green toxic deck that can grow wide and tall and is poisoning at the same time.
