rflower

Why Research/Development in sideboard?

Blue white ey? ;)
You have a nice amount of synergy :)

I meant Carrion Feeder instead of Putrid Imp... my bad. Its an enabler for Demonic Rising and is nice with Viscera Dragger and Geralf's Messenger. Also, just thought of Phyrexian Obliterator. Could that card find a place in here?

looks good m8

Yeah. Agree with DedWards. If you hadn't realised: Fumigate + Selfless Spirit...

Looks brutal (to yourself and your opponent).
Why not 4 Death's Shadow? You could also exchange Innocent Blood for Smallpox.
Putrid Imp is another possible sac outlet.

Exchanging Innocent Blood with Fleshbag Marauder or Merciless Executioner will simultaneously make this deck modern and give you the aggressive board presence of a 3/1 attached to the 'each player sacrifice a creature' ability.
Jungle Hollow is also strictly better than Foul Orchard.

Just for the head's up, Sadesi's Faithful is a strictly better Kraken Hatchling. Also you might want to add a description as it encourage and help more people to give better comments.
You don't seem to have very many win-conditions. This looks like a control deck. I would have a look at some nice multicoloured or just mono coloured big fatties for finishers and definitely some board wipes like Final Judgement or Evacuation as these are extremely strong in your kind of strategy.

Descent of Dragons turns all your peaceful walls into powerful dragons.
As for Vent Sentinel not being a wall, the only card which cares about actually being a wall is Glyph, and you have so many walls in the deck that you are sure to have another creature that is one.
Another card I just thought of is Goblin Diplomats. Could be brutal combined with any of your powerful walls such as Wall of Razors and Wall of Lava. Also could be crap. not sure haha

Faithless Looting is a great cheap red pseudo card drawer but I'm sure that you need it..

I love it, so quirky, cheap and potentially effective. Vent Sentinel is too slow and boring hey? Descent of the Dragons could be cool as a one of in sideboard at least.

I would also suggest Faithless Looting to find your combo cards. You could quite easily lower the number of Seed Guardians and Sunflare Shamans to accommodate this change.

Yeah of course.

Suture Priest seems a way better way to win with the infinite combo.
I do not think Emmara Tandris is needed at all. Gelatinous Genesis is your only creature token creator, and if everything goes to plan they will have infinite toughness. Additionally, some mana acceleration is quite warranted. I would add some cards such as Elvish Mystic.

um.. Wouldn't it just be better to cast something like Anger of the Gods or an overloaded Mizzium Mortars..
The viability of your deck aside, I would definitely add Faithless Looting in a deck like this. Also, if you really want to play Worldfire, I recommend adding green for ramp.

Sorry I meant just one less, i.e. 3 Anafenza... What about Duress or Despise? Are they that much worse? (real question as I'm not really sure)

Doublestrike?

Mogg War Marshall instead of Myr Sire. Also I would consider Skin Invasion. I like the idea

How 'bout some hand disruption? Very strong and could smooth out your curve..
You also might want a few less Anafenza, maybe just one, as its legendary.

Goblin Bushwacker could be kind of nice but its too expensive in money terms for what it adds to the deck. The double red of kicking won't happen that easily too.
Impact Tremors seems a little lack lustre. 3 Damage in an almost best case scenario is strictly worse that Incinerate. It feel it needs to be more built around to be effective. I'll build a deck around it just for you <3 ;)