Pointed Discussion

Black High Tide (at sorcery speed) is good.

I agree it's still useful, yet i'm bugged by the fact that this one is only a sorcery, though...

I personaly perfer using a Dark ritual instead of this.

This might be helpful in combo with Dark Ritual and Cabal Ritual to drop something big into play or fire off a massive spell.

Center piece of the Dark Tide deck, using Muck in combine with other CIP add mana creature from black to generate massive amount of mana.

Rain of FIlth in the same block gives you instant speed and a scary drawback.
Casting multiples of these in one turn is great. Using Rain with Second Sunrise is also great.

Combo with Urborg, Tomb of Yawgmoth? Play in mono-green land-ramp with Sylvan Scrying/Reap and Sow/Primeval Titan to fetch it.

Then you'll have a lot of mana, even by land-ramp standards. Go nuts!

So, it's free to cast provided you have 1 swamp, is as close to a dark ritual at turn 2 and 3 as you can get. And moving forward is absolutely brutal. Asside from the fact that it's a sorcery, what's NOT to love about this spell? Ever heard of Black Mana Mages needing more land?? No, of course not, same goes for me. And if you happen to be playing mono black and your opponent is as well, it can EASILY turn 1 measley swamp into 10+ mid to late game. Having said that, obviously I cannot justify giving this a 5/5 but I'm doing it anyway! ;)

1 Swamp: 1 mana lost
2 Swamps: no gain
3 Swamps: 1 mana gain
4 Swamps: 2 mana gain
5 Swamps: 3 mana gain

Kinda like a later-game version of Dark Ritual. Takes 4 Swamps to match the Ritual and 5 to exceed it, but then Ritual is stupidly good.

Probably not bad in a deck that runs big black fatties.

this + Palinchron = infinite mana preferably with some underground sea