Get the extra benefits of cards like Borborygmos Enraged, Seismic Assault, Bone Miser, Green Goblin, Nemesis, and Lluwen, Imperfect Naturalist, and then bring those lands right back to your hand
If more cards were to focus on the commander as the focal point of the deck rather than splitting its focus across multiple archetypes, this deck would actually be interesting
The current most popular ones seem to be Choice Belt and Cape Of Toughness
Should you fail to pay, Primordial Ooze not only taps itself (and thus becomes useless), but it will deal that much damage to you
And it can also do a lot of manga in the late game when you need it to
They are slow and vulnerable but they make up for this by also performing other roles, things to hold equipment, use in some sacrificial capacity and so forth