DedWards

I know it's blue, but Paradox Haze speeds up all those upkeep triggers, making the damage over time go a little faster.

Down side to the Valakut option: the deck is effectively 4 colours. Or at least the land base is. This can be an advantage too as it gives access to a number of red cards too.

I also just realised Knight of the Reliquary decks have a natural enemy: Blood Moon (and Magus of the Moon). I've been testing a Modern Moon based deck these last few weeks and I'm really enjoying it.

That might be worth considering for sideboard as it allows you to go wide.

You just have me an idea. Using the Retreat + Knight Combo, you could deal damage directly via Valakut, the Molten Pinnacle and any Forest Mountain / Plains Mountain. The trick here is having two sacrifice targets for the Knight, so that you can fetch Valakut off the first and continue the combo with the second.

The way I understand the combo, you can tap each land you fetch for mana before sacrificing it to fetch the next one. With this in mind, have you thought about including something like Kessig Wolf Run? You'd need to include at least one Forest Mountain or Plains Mountain to fetch with the Knight and to tap for red to pay for Kessig, but trample and a power boost to the Knight is well worth it. Alternatively, Rogue's Passage makes the Knight unblockable for the turn.

The Borderposts mean nothing if you don't have a land to return. I suggest increasing the basics or including a set of Darksteel Citadel. Reducing the number of Mistvein Borderpost and Wildfield Borderpost should clear up enough space for them.

Etherium Sculptor is worth considering as, if I'm correct, it reduces the alternative cost of the Borderposts to just bouncing a land to hand, allowing you to tap for mana, play the Borderpost, and use the mana for something else.

Got a set of Lupine Prototype :D

Also have a set of Sin Prodder. Thinking of trying to work in 2-3 of it.

Ring of Kalonia says; "At the beginning of your upkeep, put a +1/+1 counter on equipped creature if it's green."

What this means is that the equipped green creature gets a +1/+1 counter only in your upkeep, not any other upkeep. So multiplayer means nothing to the ability. Same for Forced Adaptation, only your upkeep, not any other upkeep.

Now there are ways to get multiple +1/+1 counters per trigger. In colour, we have Hardened Scales, which works whenever a +1/+1 counter is placed on a creature you control. Out of colour, we have Paradox Haze, which gives extra upkeeps, thus extra triggers of Ring of Kalonia; Forced Adaptation; and Honden of Life's Web (assuming you enchanted yourself).

Kazandu Tuskcaller - level 2-5 this creates a 3/3 Elephant a turn. Level 6+ and it creates two 3/3 Elephants a turn.

Ring of Kalonia

I've proved time and time again that with two colour decks, the Fetch + Shock lands are NOT a necessity. Though, if you have them already, it is good to use them.

Those are very good green cards, though Atarka's Command doesn't impress me as much in a build like this, at least not mainboard. You also forgot to mention Mutagenic Growth. If you're going to cast Temur Battle Rage on a Prowess creature, Mutagenic Growth is two life for 6 extra damage.

Minor Mainboard edit. My friend found a 4th Blood Moon, so goodbye Magus.

I'd run at least two Ratchet Bomb, just in case. With 0 charge counters on Ratchet Bomb, you can sacrifice it to kill all tokens you gave the opponent.

Clone; Phyrexian Metamorph; etc are worth considering both for the Hunted and Massacre Wurm.

Blood Artist is another strong card for this type of deck.

Ghostly Prison and Norn's Annex preventing attacks means that you'll be taking no damage quite often, so Luminarch Ascension is worth considering. It gives you a good supply of 4/4 flying Angel tokens and you don't have to worry as much about board wipes.

And with the Angel theme, Seraph Sanctuary might be good too.

Edited the deck again. This is most likely the build I'm taking to WMCQ, though the sideboard may change before then.

Greater Auramancy - Your enchantments have Shroud.

Maybe Fabricate to search for Memnite?

Frozen Æther - Artifacts, creatures, and lands your opponents control enter the battlefield tapped.
Herald of the Pantheon - Enchantment spells you cast cost {1} less to cast, and whenever you cast an enchantment spell, you gain 1 life.
Mesa Enchantress / Verduran Enchantress / Eidolon of Blossoms - draw cards for playing enchantments.
Starfield of Nyx - Returns an enchantment from your graveyard to the battlefield each of your upkeeps. Not sure if the clause that animates your enchantments is a good or bad thing.
Temporal Isolation - a Pacifism effect with flash.
Privileged Position - Other permanents you control have hexproof. Good for sideboard?

Here's my take on this deck:

http://www.mtgvault.com/dedwards/decks/cursed-witch/

I didn't realise they're that expensive. I've had a set for a while now, but I always thought they'd be $1 each, at most. Star City Games currently has them for $3.49 each 0.o

You're already running Arbor Elf, so why not run Utopia Sprawl? Together they provide so much mana. I've already done this on a number of occasions in a Modern RG deck I'm running:

T1: Forest
Arbor Elf
T2: [land that can produce green]
Tap [land that can produce green] for green
Play Utopia Sprawl on untapped Forest (I often call Red, but you'll call green)
Tap enchanted Forest
Tap Arbor Elf to Untap enchanted Forest
Tap enchanted Forest
Play something that costs 4 mana
T3: [any land]
repeat tap untap procedure above
play something that costs 6 mana