Commander is a format where up to four players battle it out with 100-card decks, where each deck is built around their Commander (a Legendary creature of their choice)
The Red, White, and Black cards in this mythic rare land cycle aren't nearly as powerful or expensive as these Green and Blue counterparts
And finally, what is your favorite Lesson
By paying 7 mana, you get Chaos, the Endless, which isnt that great of a demon but is an interesting secondary mode, and means you don't mind trading this early
2 Card Gard Leader Cases per Pack
In that sense, Graf Reaver is your choice of a 3/3 for 1B with some downside or a clean answer to a planeswalker, with the occasional option to sacrifice a different creature and get both