Sorin Markov is running a little low on archetypes that support him with both high mana and high black cost requirements
Like Mutavault, it enters untapped and can animate for just one mana
When you play it early, it smooths your draws
Tinybones's first ability has you draw just one card and lose just 1 life, no matter how many opponents discarded cards and no matter how many cards were discarded beyond the first
To outwardly recognize that was happening but then drop in to say, Ok, this week lets talk about Ikoria and how annoying Lukka is as a character, felt disingenuous to the larger circumstances
We don't have a lot of recursion in the deck still, so while it's heavy on sacrifice, we want to make sure that we get the most bang for the buck for our losses