Its certainly a role player and wont be ubiquitous in these decks, but the incidental value it provides is second to none
If a creature an opponent controls dies at the same time as Massacre Wurm, Massacre Wurm's last ability triggers for that creature
You can also use ability doublers like Illusionists Bracers to increase your mileage and turn Karlov into a serious removal machine
I do want to point out, though, that the lack of burst-out spells, Commander 2019 can leave you feeling a bit underwhelmed
Epic cards feature special card frames, textures, and foil to set them apart
Queen Allenal of Ruadach Queen Allenal of Ruadach is a creature that gets bigger the more creatures you have, and thats already an interesting incentive to run tokens, although its pretty vanilla