Named for the small (you guessed it) rule box that stands out on the card, three types of Rule Box Pokemon are currently legal in the standard format: VMAX, VSTAR, and Radiant
Again, creature rocks aren't in EDHREC.com but they seem like nice ways of adding bodies without sacrificing mana rocks or land spots
I'm not sure if it was restricted out of fairness, or if they actually thought the card was overpowered at 2 mana (can't imagine the thought process, when crusade and bad moon were fine, but then, they restricted gauntlet of might, so maybe they didn't like red guys getting pumped!) Rukh egg looks fine today, maybe even pretty weak
So what other colors to add
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But theres a lot to this mechanic, and you can almost think of it as three abilities in one