This is currently my first build running a Selesnya Proliferate deck with [[Ajani, Sleeper Agent]] as the Commander. Since there is only one other card in Arena right now that can deal poison counters (Fynn, the Fangbearer), we are relying on a lot of Proliferate effects to do multiple things: Building up a bunch of +1/+1 counters on our creatures for a good old-fashioned beatdown, building up loyalty counters on our Planeswalkers to ult them faster, or building up Poison counters on our opponents to close out the game faster. I feel there is a lot of potential here, but I also feel this isn\’t fully optimized yet.