Free sacrifice outlets are always strong, even type-specific ones, and Nemata lets you pull off dirty tricks like attacking with a board full of Saprolings, then sacrificing the ones that get blocked to pump up the ones that got through for extra damage
firstly, it lets you keep the extra cards you draw, but it also removes decision making at the end of a turn, which can help you navigate longer games before burnout hits
Most veteran players will know this, but in card games with a life value, gaining life is not as important as spending it
Naturally, this becomes even harder to withstand if you use Najeelas own ability to start getting extra combat steps and raising your life total by giving your creatures lifelink
Not to mention she'll be pulling in lore while providing this solution
First off, you must sacrifice two creatures with Whisper, Blood Liturgist and only one with Hells Caretaker