Let's look at what that means
All TCGs are plagued by the age-old problem: power creep
Belzenlok is not one of those commanders whose necessary for the deck to work, but when used at the right time can really accelerate your board
The card destroys creatures or enchantments, which gives it great flexibility, and though it forces its caster to lose life equal to the permanent's mana value, that's not such a big deal in Commander where the starting life total is 40
This means that, even if you have seven cards in your graveyard when you first cast the spell, if you lose cards from your graveyard before it has resolved on the stack, like through paying escape costs or a well-timed Tormods Crypt, you could fail to meet the threshold by the time it resolves
If you limited yourself to gaming for a mere eight hours of day, you would get 24 years of gaming from your purchase