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Not only that, but he is the only one of the main Haymaker trio not to have any retreat cost

It's a very similar effect to another card that came out in a Magic: The Gathering set earlier this year: Bristly Bill Spine Sower

This is true for Etched Foils as well, and Assassins Creed decided to take advantage of that

Going a bit higher up the curve isn't as much of an issue for green with the many types of mana ramp it has and getting more return on each card becomes more worth it when you have that ramp

Its aggressive nature is even more advantageous in the generally slower Commander format

It has a lot of tools to enable it to keep a board presence, and some powerful swingy cards