MTG Salvation

I second the idea of Land Tax - find cards that will be playable in multiple archetypes and color combinations and your overall utility for the $100 will be much higher.

Ulamog and Kozilek do good work protecting you from milling and giving you a massive finisher.

If pimping is your thing, the MPR full art Wrath of God is beautiful. A few Unhinged Plains will hold their value well and really improve the look of just about any deck.

Strip Mines are cheap but Wastelands are within your price range - beware of a reprint as far as value goes but if your meta has too many broken lands it might be nice to have a backup to Strip Mine. Crucible of Worlds goes in most anything (and plays nicely with Strip Mine/Wasteland if you don't like having friends).

How about -

A: (all revised)
SP+ Volcanic Island
NM Taiga
NM Plateau
NM- Scrubland
Minty-minty still-a-bit-shiny best-condition-revised-you've-ever-seen Badlands

B:
$400 cash.

Get your playgroup on board with an Ink-Treader Nephilimdeck! So many opportunities for shenanigans.

There is absolutely nothing wrong with packing up your cards from a trade that's going south and telling the other person "I'm sorry, I just don't think we're going to make a deal today". Thank them for their time and move on. Personally, I trade a lot and would rather not waste 20 minutes on a 4-dollar trade. It's not worth my limited Magic time.

As far as talking someone into a trade they're not entirely convinced of (like OP's problem), my usual strategy is to ask how long they've had the card in their binder. Obviously, this won't work with hot hot standard stuff but for most things (especially EDH material or foil commons/uncommons) it will get them thinking along the lines of "yeah this might be valuable but I'm not getting any use out of it here".

Alternatively, you could find out what they're building and suggest cards from your own binder to help with it. This works really well on the newer players who don't have as large of a cardpool (Do not rip off the new players either - get a third party to give his/her opinion on the trade or show them via tcgplayer/whatever). Again, that's a better strategy for unloading EDH/eternal stuff than standard but could be easily adaptable for standard too.

My pet peeve is people who play with proxies but don't bother asking if it's okay at the start of a match, especially in a paid tournament. If that makes me an elitist, so be it. I collect and trade for cards. A lot of them are expensive. It feels pretty disrespectful to my efforts when my opponent pulls out a scribbled bit of paper with "Mana Drain" written on it. Yeah, I get they're expensive. Sure, you might not be sure you want it in your deck. But with something like that? Run Counterspell and save your pennies. Those other guys with fancy cards didn't get them overnight either.

A close second is people who are invited to play in what they're informed is a fairly low-powered match (maybe people are testing new deck ideas, maybe they're new and built it out of standard cards, maybe it's a Loxodon-themed lifegain mirror match, maybe whatever), and they pull out a very tuned deck and proceed to stomp face.

This means, btw, than when you use your proxied mana drain to counter my general while I am testing a new deck and teaching a new player, my perception of you goes from "hey, he plays EDH! He's a pretty cool dude" to "(unprintable)".

Two Oblations for the price of one. Protects herself perhaps better than any other planeswalker yet. Spits out a Serra Ascendant upon ultimate.

The only thing that seems off to me is the hood that doesn't quite peak over the top of the frame. I'm willing to believe this one's real, though. And if it is, it's definitely a nod to EDH players that's still quite playable in standard. Very good.

I'm pretty excited to pick this up for my Maelstrom Wanderer deck. He's proven to be beastly. Just remember, not every card is for every player

I am wrong. Apologies!

Gnaw to the Bone is a absolutely fantastic way to put yourself out of reach with this deck. I ran a similar one for a long time. Also, Ghoultree can do work. Especially in tandem with Artful Dodge.

I'd remove the Gravecrawlers and Tragic Slips. Up the Tracker's Instincts to 4, and swap the Thought Scours for Mulches. Mulch with enough flashback/synergy for dead critters is almost a draw 4 and fix your mana. Pretty useful.

Good luck!

Honestly, I didn't like the card. It was way too build-around and not very useful. Unfortunate that it had to get shot down like this, but with it leading what is probably my favorite submission in the test polls on these forums I'm glad to see it go.

You know what would be awesome? Ivory Mask and Whispersilk Cloak and an infinite untapping engine. Kill the table with a randomly exploding goblin.

Yes, I was the person this card was made for. You can send your copies to me.

Quote from Shadowfate

I don't like Lotus Warden with a trigger during your upkeep. When it's then, it pretty much forces you to play one mana down. Then when it finally explodes it gives you 3 mana during your upkeep so it can only be used for instants and things with flash, and your own upkeep is pretty much the worst time to play those. Maybe make the trigger happen in your precombat main phase and make it optional?

Agreed. Perhaps it could be "Remove three +1/+1 counters from ~: add 3 mana of any color to your mana pool"? That would make play decisions around it very interesting - do I let him keep growing into a beater or spend the mana for this big spell? It would also fix the obvious problem of three mana only usable during the upkeep.

Braingorger is a bit too strong, as determined by the precedent of Sign in Blood. An extra 1 for a 3/2 is pretty darn powerful. I like the idea; maybe make it a 1/2 or 1/3 instead.

Seasonal Harvest and Decipher are excellent designs. Powerful enough to push in a cube but won't completely break the game. Nice!

Primal Infusion really seems like it's out of the color pie. Fast temporary mana is a red thing. That said, extracting it from a creature card does feel very green. Perhaps it could be a Gruul card instead? Either way, I like the design (at least, until someone uses it on the second turn to cast Ulamog off a discarded Emrakul or similar...). It might be safer to give it a restriction that mana produced in this manner can only be used to cast creature cards.

Scion of the Ur-Dragon EDH + Scapeshift seems like fun times...

I've always wished Spawnwrithe were a little more playable. Today, I got my wish. So what if it's not really standard constructed viable? A lot of us play multiplayer casual and this guy will take over a table in very short order. I'm excited to get my hands on one.

So when exactly does Biovisionary trigger? Obviously the card says "at the beginning of the end step" but is that your end step or any end step?