Every single turn, Atraxa can tick up your planeswalkers, accelerate your sagas, buff your creatures, accumulate poison, increase your energy, or any number of other powerful effects
The key here is Eternal has managed to make all these things quicker and more satisfying than most other digital CCGs that try them, not sacrificing depth for accessibility
The new Witherbloom deck being filled with fun ways to benefit from life gain
You'll resolve the abilities one at a timeyou won't draw that many cards at once and then discard that many cards
Blight Mound Blight Mound can go off if you can make a sacrifice loop with a nontoken creature, including persist combos
One main advantage of these cards seems to be that you can gain cheap instant or sorcery effects from something with the card type creature. This is important for effects like Duskwatch Recruiter and Eladamris Call