In reality, I feel like this isn't too far off something like Eye of Vecna, only you're paying more up front to not have to pay later, have a condition to meet, and get the card at the end of turn
There are also some instances where typal coupling is used for flavor and gameplay reasons
At four mana, and considering you need a way to make sure it goes to the graveyard, this symmetrical effect may not seem too strong
Malanthrope being about to eat a whole graveyard means that its a significant mid- to late-game play which is bound to have us end up with a pretty big flying creature
Mathas is a bounty hunter and its on the lookout for some high-quality targets
When your commander would go to your hand or library, you may send it to the command zone instead, and it never enters those zones