mystery 2 booster box mtg Retail Exclusive 2019 #1 and one Research and Development Playtest card Let's Open MTG Mystery 2

They are similar in DP cost and stats, boasting 1,700+ HP and some big attacks

Caparocti Sunborn Caparocti Sunborn looks like more of a Limited card than a Commander card to me, but you could definitely build it if you want

Natural Order

All mono-colored legends in Commander Masters effectively have the Partner ability, and it's an improvement on the original Partner effect from Commander 2016 in many ways

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The thing is that Reckoner at least does something different and new while Chained to the Rocks is just a cheaper Journey to Nowhere