Valgavoth's ability to draw cards and gain +1/+1 counters whenever an opponent loses life for the first time on their turn allows you to harness this seemingly indiscriminate damage and turn it into something truly powerful: card advantage
Of course, those cards do nothing without enablers to fill the graveyard
It just takes a lot of time to figure out the real order the cards were released in, because of all the reprints, and I end up just using a lot more time on that than actual research on the topic, but that is also partly, because when I start one of these, I will have an idea on what I want to say
This is mostly just a two mana 2/1 with Menace
Sothera, the Supervoid Ive seen people bemoaning Sothera, the Supervoid as another Grave Pact/Dictate of Erebos-style effect, but I think theres some nuance here
The high price for this card was at the beginning of the year, when it was close to $20