Alright, this is a deck that might appeal more towards people who play a lot of vintage/legacy, and it will certainly appeal to more combo and toolbox oriented players.

First of all, as the name suggests, there is an Ooze as the central focus of this deck. If you didn’t guess, it’s Necrotic Ooze.

So the trick was to build a deck that makes use of the Ooze gaining abilities from everything in your graveyard, since yours will be more reliable than whoever you’re playing against.

The deck runs 16 creatures, which may be a little too much for you players who are geared towards control more than anything else, however it’s mostly one-ofs to fuel your Ooze.

The first two you have provide your primary win condition; Pestilent Souleater and Trespassing Souleater. A 4/3 inblockable creature with infect is nothing to scoff at, especially when you combine it with the deck’s third utility card, a phyrexian fire-breather.

It’s fairly straight-forward, pay any combintion of life and mana to turn your Ooze into a 10/3 unblockable creature with infect, just make sure to keep mana open for your Leaks and Dissipates to protect it.

Now, you COULD just run a bunch of copies of each of the souleaters the deck uses, however I opted to add in more options.

One of the best creatures to combine with the Ooze is perhaps the Civilized Scholar, which is why the deck runs four. The reason why is that as long as you can discard a creature, you can keep drawing with the Ooze. It is not a dual-faced card, which means discarding a creature will cause it to untap but not transform (because it can’t).

You can also put the Scholars directly into play and use them as draw, blockers or beaters.

Spikeshot Elder might seem a little out of place at first, but if necrotic ooze uses it’s ability, at the very least it will be dealing four damage to whatever you need to go away. This ability combines very nicely with the black and red souleaters, pump it to make it even bigger (imagine blowing up a titan with your ooze), or giving it infect to permanently weaken something your opponent controls. You can also have it burn players, preferably for poison.

Myr Propagator is another seemingly odd choice, but whenever Necrotic Ooze uses an ability that has the card’s name in it, you treat it as though it’s referring to the Ooze. So for three mana at the end of your opponent’s turn you can make a copy of your Ooze. Amassing an army of 4/3s that can all be given a variety of abilities at a moment’s notice is as effective as it sounds.

Drifting Shade gives you the ability to pump your Ooze for black mana, giving you an additional option if you’re low on red mana or life. An arguably more important thing it provides is an increase in toughness to protect it from Volleys and the occasional inferno titan.

Steel Hellkite is your last utility creature. It will enable you to spend excess blue-mana to pump your ooze, but it’s primary appeal is it’s ability to clear your opponent’s field of anything that’s causing you trouble. You can hit them with the unblockable ooze, then use fathless looting in your second main-phase, ditching the hellkite then using the ooze to blow up something of theirs. Spikeshot Elder also turns it into instant-speed removal, provided that you have enough mana.

Faithless Looting, Forbidden Alchemy and the Scholar are your ways of getting things into your graveyard, as well as providing you with counterspells or lands.

Sideboard: Steel Sabotage will let you handle Wurmcoils, Swords, but most importantly, Nihil Spellbomb. Spellbombs will cripple this deck just as badly as they will a reanimator deck.

Flashfreeze helps you with red and green decks.

Negate will help you against other control decks.

Witchbane Orb will prevent a myriad of things that can all be very unpleasant for you.

Flameblast Dragon fills up your last side-board slot as a one-of, on the off-chance that your opponent is very happily hitting your stuff with Surgical Extraction. It also privides you an answer against Phantasmal Images and provides you an alternate to the spikeshot elder, the only downside is that you can only use this ability when you attack, and you have to pay one red mana in addition to a red mana for each point of damage you want to do.

Other options: Saberclaw Golem provides you with first-strike to help against anything with deathouch. Insatiable Souleater will give you trample, however you’ll have to pay the life for the activation cost.

Due to how much life you may or may not be dumping into your Oozes, any sort of lifegain would be invaluable, however the best source of colorless life-gain (Elixir of Immortality) would quite likely hurt more than it would help.

Onyx Mage lets you give your Ooze deathtouch, which is desirable if you use the Insatiable Souleater.

Crimson Mage provides you with haste, however it will have limited useability outside of a late-game win.