Some cards reward you for putting +1/+1 counters on themselves or other creatures, most notably Danny Pink, Basking Broodscale, and Scurry Oak
Since creatures matter so much for this mechanic, cards that remove permanents or otherwise impact the board tend to rank higher than those that don't, though the Court cycles are very strong since they play well with board wipes
Ultimately, since Izzet decks tend to be faster than Rakdos Midrange lists, the Innistrad Slow Lands have less utility
Legendary creatures like Nicol Bolas and Nakusar add versatility and power to Commander decks
Well, things have changed a lot over the years, and while traditional fantasy settings remain at the center of the franchise, its canon Multiverse opened up almost endless possibilities, including themed crossovers with properties like The Lord of the Rings, Final Fantasy, and even Marvel