The reasons are simple: Compared to Legacy there are a lot less powerful Utility Lands to return which will have a big impact on the game, most of the time you get Fetch Lands to make sure you are hitting a land every turn (which is definitely good)
The aggressive new Leader from the Starter 21 deck, Red Monkey D type card you need for the upcoming turns
Bonehoard Dracosaur is the common modern-day fusion of the two: the Mullslayer, if you will
The sheer number of hyenas from The Lion King makes this deck a vicious one for opponents, and the new Tug-Of-War Action card is a wonderful addition for helping players who are facing off against Evasive-heavy decks without making it a pointless card for non-Evasives
The face commander of Graveyard Overdrive is Disa the Restless
Play big spells, get big creatures, and unlike some of these commanders, the good cards you add to this deck will stay good even if opponents are bent on removing Rootha