You can cast The Scarab God all game long for the regular five-mana which, let's be honest, is way too cheap for a card with this power level
for example, if you have drawn multiple copies of Kolvori and want to get use out of the extra copy, or if you have nothing to do on Turn 2 and developing a slightly-below-rate mana rock is better than doing nothing
There are lots of situations where you draw it and don't want to use it at first, perhaps you have lots of lands or only very low costing cards, the Chrome Mox will sit in your hand but instead of being dead it will be a get out of jail free card
We also happen to have a similar taste in cards
Amulet Titan, maybe, for at least one slot to get back a destroyed Slayers' Stronghold or Sunhome, Fortress of the Legion effect