mtg commander poison deck Atraxa, Praetor's Voice PROLIFERATE COUNTERS Magic Custom C – CommanderComplete Reach (This creature can block creatures with flying.) Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.) Whenever another creature dies Fynn, the Fangbearer - Deathtouch

I expect them to see play in far more than just themed decks like this

Even without infect creatures, Hapatra itself can spread -1/-1 counters whenever it deals damage

She is a masterpiece

Hazoret the Fervent If you played at all during Amonkhet , you should absolutely be familiar with Hazoret

Upon entering the battlefield, these lands will immediately be sacrificed and you will search your library for a basic land that is either one of the 3 colors within that crime family and then gain 1 life

When it ETbs, you choose a creature type and then it arrives with your number of those you control in counters and that kindred type is increased in size by the counters