If the theoretical Eldrazi Aggro deck exists, this guy might be a key element
Being able to Proliferate multiple times on the same turn, Inexorable Tide will allow you to give your Creatures huge buffs or take your opponents out of the game in one fell swoop
Functionally: they often behave like proxies because they arent legal for sanctioned tournaments , so the only places you play them are the same places you play proxies: casual pods, unsanctioned nights, cubes, and playtesting
Sin, Unending Cataclysm Sin, Unending Cataclysm is something you wear on your sleeve when you put it in the command zone
And that you can sacrifice Spirits to add a red mana to your mana pool, which means that each noncreature spell you cast gives you the potential to cast even bigger spells next turn, or get to a double-spell turn