Archipelago
Land- Island
Archipelago comes into play tapped.
When you play Archipelago, you may draw a card.

I like the idea behind, having a non-basic land with a basic land type, like the schocklands. However, this land is INSANELY powerful. Not to mention, with stuff like bouncelands, and Fathom Seer (it’s an island, after all), and Crucible of Worlds, etc, this could be VERY abused. Also, playing lands doesn’t use the stack, so it’s a free draw engine ready to be abused, and nearly unstoppable, too powerful. Perhaps if you had to sacrifice another land, or another BASIC land...

Volcano
Land- Mountain
Volcano comes into play tapped.
When you play Volcano, you may deal 2 damage to target player.

This one I like! I think it could also target creatures, although that could possibly make it too powerful. Perhaps targetting ONLY creatures! This way, if you want to open the game with it so it won’t hinder your mana development too much, then you lose the benefit. Otherwise, you "lose" a few turns. However, it’s still abusable as the one above, so I’d probably make it deal 1 damage only. But I liked this one very much.

Marsh
Land- Swamp
Marsh comes into play tapped.
When you play Marsh, you may make target creature +0/-2 until the end of the turn.

I’d just make it -2/-2, won’t make a difference anyway, and simetric cards are easier on the eyes. THIS one is VERY nice, but I think should be -1/-1 only, after all, for the same effect, you usually spend 2 mana and a card.

Woodland
Land- Forest
Woodland comes into play tapped.
When you play Woodland, you may return a basic land card from your graveyard to your hand.

This one is perfect.

Prairie
Land- Plains
Plains enters play tapped.
When you play Prairie, gain 2 life.

Another nice one.

I was surprised that none of those titles were taken.

Ever since the game started evolving from Alpha stuff and such, after Arabian Nights, Wizards of the Coast has decided to create its own unique identity, making their own worlds and such. In doing so, they had to forego using existing names to stuff, like landscapes, characters (Aladdin, Ali, etc) and such.

Anyone have an idea for a title?

I need to know what the set is about to give you an idea. First sets are important, since the whole block is named after it. Nowadays, they usually use the world’s name someway, like Mirrodin, Champions of Kamigawa or Lorwyn.

Anyway, more lands next.

Btw, I could easily see these ones at the uncommon slot, if you want to assign rarity. Pretty nice.

Bermuda Triangle
Land
Bermuda Triangle comes into play tapped.
When Bermuda Triangle comes into play, sacrifice it unless you sacrifice two other lands.
: Add 2 to your mana pool.
, pay 1 life: Add .

Very nice. I changed the template in this one to "comes into play" because it’s a triggered ability, so something should trigger it, and playing the permanent shouldn’t do it, because playing lands do not use the stack, so you wouldn’t be able to respond. This way, the land comes into play, triggers the sacrifice, and you can respond, with, oh Stifle or Trickbind, or even Voidslime? FUN, huh?
PS: Tapping AND paying life are parts of the cost, so they should appear separated by commas, and before the ":" mark. Always keep this in mind, you can only have one ":" mark per ability. What comes before it is a cost, what comes after is part of the effect. This matters for loops involving cards like Mangara of Corondor and Nevynirral’s Disk.

[b]Circle of Death
Land
Circle of Death comes into play tapped.
When Circle of Death comes into play, sacrifice it unless you sacrifice two other lands.
: Add 2 to your mana pool.
, pay 1 life: Add to your mana pool.

[b]Cosmic Triangle
Land
Cosmic Triangle comes into play tapped.
When Cosmic Triangle comes into play, sacrifice it unless you sacrifice two other lands.
: Add 2 to your mana pool.
, pay 1 life: Add to your mana pool.

[b]Circle of Life
Land
Circle of Life comes into play tapped.
When Circle of Life comes into play, sacrifice it unless you sacrifice two other lands
: Add 2 to your mana pool.
, pay 1 life: Add

Crystal Quarry (Reprint)
Land
: Add 1 to your mana pool.
5, : Add to your mana pool.

And the point of this set is multicolor everything.

You know, making something like this shortly after Ravnica may be kind of harsh, since comparisons are inevitable, and Ravnica bordered the overpowered on its own...

[b]Mana Rift
Legendary Enchantment
When Mana Rift comes into play, target player loses 10 life and you gain 10 life.
At the start of each of your turns, add 2 mana in any color combination of colors to your mana pool.
Evoke-

The template I violeted doesn’t work. It has to add the mana either at a phase, so you can use it. Either during the upkeep (instants and abilities only), at the start of the combat phase, at end of turn (same), or at the beginning of a main phase. I like the evoke idea, very nice, but dangerous. If you can multicolor this out easily, all you need is a Boomerang to win. Evoke, gain 10 life, let the sacrifice trigger on the stack, bounce it back to your hand. Of course, you could just have 4 copies of it, but you see what I mean, it gives you outs to having to draw 2 of 4 copies. Perhaps it could have Epic?

[b]Mana Spill 1
Instant
Counter target spell. Destroy target land.

Too easily splashable. I know the idea is to facilitate multicolor, but making multicolor overpowered is not fun. I think the [W/BW] part could be dropped, you already have the mandatory blue (so countering a spell is covered), and white does not destroy lands, so either make it 1, or make it 1, which would make more sense, make it more useful, and make for one hell of a card already, destroying lands at instant speed WHILE countering a spell? I’m on for it! WAY better than Cryptic Command!

I decided to make Mana Spill (1). Sound cool?

It does, but it makes using it less useful. For instance, I had an old deck revolving around Magnivore. It was UR. Making it URB would be a mess, so I’d make some neat multicolored cards, but careful not to make too many.

Also, how about split second on Mana Rift? That’d solve the Boomerang problem. And I’ll make the evoke (1)

Split second solves nothing. It makes it even worse, since now it can’t be countered. You play, it can’t be countered (essentially, that is) nor responded to. It resolves, THEN the evoke triggers. Now you CAN respond to it.

Sunburst
Enchantment
Each creature with sunburst comes into play play with a +1/+1 counter on it.
Each non-creature permanent with sunburst comes into play play with a charge counter on it.

Ok, I sense a pattern here, so let’s cut it here and now, nothing ENTERS play, stuff COME INTO PLAY. Also, what’s this thing trying to do? Make sunburst better or hose it? It it’s to make it better, it kinda sucks, too high of a cost for a pretty lowly effect. However, as it’s worded, it HOSES them, since instead of coming with X counters, they’ll come with 1, the text creates a replacement effect. And as a hoser, it sucks again, could be an artifact, easier toc ast, since it’s too narrow. How hard is this to play? And how hard is Flashfires or Boiling Seas?

Astral Explosion
Instant
Target creature gains +1/+1 for each basic land type among lands you control.

Check Gaea’s Might. See how better it is. Cut this one. And stop making every card unplayable, all around in colors!

Crystal Shatter 3
Instant
As an additional cost to playing Crystal Shatter, sacrifice an artifact.
Add .

This one I like, but it either must be an artifact instant, or have a colored mana on the cost (even if you mean the card to be colorless).

Astral Essence 7
Legendary Artifact
Sunburst.
Each creature you control gets +1/+1 for each charge counter on Astral Essence.

Cool. Maybe even underpowered, at the cost.

Celestia Aster
Planeswalker - Celestia
+1: Put a charge counter or +1/+1 counter on target permanent with sunburst.
-2: Put a charge counter or +1/+1 counter on each permanent with sunburst.
-8: Destroy each permanent without sunburst. Each player loses 1 life for each permanent they own destroyed this way.
Loyalty: 5

Kind of underpowered for a 5-color PLaneswalker, IMO. REALLY underpowered, actually. Not too crazy about the abilities, either. Sunburst, for excellency, is an artifact’s ability, perhaps you could make a colorless Planeswalker, with loyalty * and "Celestia Aster comes into play with a loyalty counter for each color of mana spent to pay for her cost".