Estinien has loads of interesting things going on, from getting aggressive with a leader you can send in the air to incentivizing both non-creature spells and dragons
It makes a Blood token when it enters, which gives you card filtering, and you can sacrifice the Harvester later to give a creature -X/-X, where X is tied to how many Blood tokens you have
[14] [15] [16] James Whitbrook of Gizmodo characterized the community response as "heated" due to the aftermarket value of the banned cards and their "popularity in competitive play"
I like the last ability, but if you slap this in the command zone, its for the mana
Next on the list might be casual players who actually want to build decks around the cards, but I'm not sure how often this happens
Its less good if you arent making at least one copy, then really good if youre making two