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Legendary Creature - Human Cleric Noble Heritage Commander creatures you own have "When this creature enters and at the beginning of your upkeep, each player may put two +1/+1 counters on a creature they control

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

[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"

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