It's the de facto best commander for its respective creature types in Commander, and that's before you even factor in the back half
in this phase, the player can put cards onto the field
To take full advantage of the +3/+0 buff, putting this on a creature with vigilance is a good plan
In addition to Hall of the Storm Giants, Crawling Barrens, the sixth man-land in Standard could see play in control strategies, as it benefits from decks with lots of mana at their disposal in the late game
Similar to Prime TimePrime Time, many games devolve into who can get their big creature first and who then can keep theirs the longest, whether through cloning, copying, or stealing others' big game finisher