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Conspiracies aren't legal in Commander unless your playgroup agrees to them

What Wizards probably meant to write there is that a player is not allowed to declare actions conditional on their opponent's choices , since the opponent's choices cannot be deterministically predicted in advance, meaning that a loop that includes them is effectively probabilistic

4 Tyrranax Rex Continuing greens trend of massive creatures loaded with keywords comes Tyrranax Rex

Some include a physical or vocal component, like Blacker Lotus or the Gotcha! mechanic on Touch and Go, some have rules that specifically reference flavor text or artists, like Carnivorous Death-Parrot and Drawn Together, and some require interacting with people or objects outside the game (Ashnod's Coupon being my favorite)