The former is a dark spin on Tarmogoyf - its mana value half that of Tarmogoyf, but it only counts cards in your own graveyard
This will allow you to bolster your forces with extra Elves throughout the game
Notably, crewing a Vehicle does not set its power and toughness, so a Vehicle will remain a 5/5 creature if you crew it
Youll want to get creatures out as fast as possible, especially your commander, and get as much damage off as you can
It breaks even in terms of how much total additional power and toughness you get with a traditional Anthem at three creatures, but giving one of them +2/+2 instead of +1/+1 can really change the texture of combat, and things get out of control once you have four or more creatures
Kemba, Kha Enduring Kemba, Kha Enduring is narrow but acceptable for two mana