Its -1 ability gives you a small but steady draw engine
Just making a copy of Belakor means 6 damage to any target and at least two cards
This can make it quite the value engine, and creates the aforementioned soft lock with Chittering Rats
If the player takes damage while their deck contains zero cards then cards will not move to the Damage Zone but Auto Abilities such as that used by [18-075R] Siefer, worded as each time you receive one point of damage, will still trigger
Similarly, in an everything-but-Green Commander deck built around Breya, Etherium Shaper, you can loot, gain life, give something -2/-2, and shoot a player for three damage
While 6 mana is a steep investment at sorcery speed, the utility here is massive for closing out board stalls