While he certainly draws on the heritage of Raging River, Space Beleren is far easier to use and far less prone to creating overly complicated game states as there can only ever be exactly three "sectors" at once
Terra lets you jam with all of the new Summon cards, and jam with enchantments, and just generally have a great time
In this case, because your life total also can't change, that damage has any other effects that it may have aside from causing you to lose that much life (such as effects from lifelink or infect) and triggers and effects can see that damage was dealt even though your life total didn't change
These days, I play at least as much Brawl as I do Limited or Commander, perhaps more
Another one I remember very clearly was that time where Garbodor with the Garbotoxin ability was running rampant and destroying any deck that relied on abilities
It is not even that hard to do it several times in a game