CurseDeReaper

Nice Idea ;) I recommend Sekki. You could use him with your shinen and make every creature block him. I've read in the rules that sekki will produce the tokens even if he has no counters on him ;). So this would create a realy greate Token Army which can be used together with Lifespinner ;)
But you could still need some more control over the board or have to take away the Control the opponent might have ;)
How about Arashi, the Sky Asunder for protection against flying creatures. Or If you want to add some money to the deck you could use an Oversoul of Dusk which might not have soulshift but quite some protection. Soulshift makes creatures quite expensive in Mana cost which is the reason why I don't use my Harbinger of Spring anymore. It's a nice card but the Oversoul is way stronger. And not too expensive.
Instead of Righteousness you could consider something which can kill even cards which aren't attacking you ;) I would search for something which could exil or destroy but for you combo with the shinen you could also search for something which redirect all damage dealt to target creature or to a player. Maybe Acolyte's Reward although it seems not good with so little white devotion. But Divine Deflection could be quite nice because you can spend your mana to deal more damage to your opponent which could defeat him/her. Especially because your other creatures can't be blocked when you attack with you shinen.

If you like to use Proliferate add some "Chargelands" like "Fungal Reaches", "Saltcrusted Steppe", or Artifacts like "Gemstone Array" and "Pentad Prism" to get a massive Manaburst. Finde a way to untap Contagion Clasp and infect each opponent with one Poisen counter to death ;) And Add a Mimic-Vat to run into the oppenten with a Putrefax-Token each turn for three mana :D
And while it is mono green try an Blanchwood Armor. I mean round three a 4/4 infect creature seems about nice ;)
Or Primal Bellow for a Final blow ;)
PS: Found my Thalid EDH http://www.mtgvault.com/cursedereaper/decks/fungus-edh/ There seem to be some of my cards in there XD. The Deck is just an idea if I change my black/green Thalid to an EDH ;) it includes another Taktik for a non Sacrifice Sarpoling Deck by turning Sarpolings to Funugs ;)

Uh the problem is that i forgotten it at my brothers house. So I can't say for sure which cards are in there.
But i can tell some of the cards I use for my win situations.
Doubling season to get twice that many spore-counters and tokens.
Life and Limb is very important especial with Sporemound either you win or provoke a draw.
Deathspore Thallid to kill opponent creatures. And with Life and Limb you can kick every green deck out of the game by sacrificing tokens and killing opponents forests ;)
Your win-conditions need to be something with sacrifice or overrun but i prefer sacrifice because the endless combo ;)
I think there was a card at Mirrodin which you can tap to sac. a creature and shoot one damage and untaps if a creature enters the battlefield. This way you have a nice finisher with the endless combo ;)
If you somehow find a way to turn all lands to forests please tell me it would be awesome to shoot all Lands away with the Deathspore Thallid while getting new Saproling-Forests ;)
And my Four favourite Thalids are: Utopia Mycon, Psychotrope Thallid, Sporesower Thallid and Sporoloth Ancient.
With those and doubling season you have enough Mana and Tokens to do really great stuff.
Ps: I don't have Mycoloth but it might be a burner with doubling season ;) Okay found the card for Deathspore Thalid and Life and limb. I think i need to add a card *-* Deepwood Elder

Thx ;)
If you draw lucky your friends don't want to figth it anymore^^. Yeah Doubling Season would be great but i use it in my Thalid Deck. But there is nothing against playing it once again with one or two cards from my cute little fungus-Deck XD

Thornbite Staff for Kiki-Jiki or Krenko, now sacrifce token befor the turn ends and repeat ;) Have fun :P

Why don't you use Radiance cards those traget a creature and all creatures which have the same color which will activate all Heroic effects. And i think there is a red/white heroic creature ;)

I was thinking to use it. But with all that Proliferate I don't need it anymore.
I use only two cards which need charge counters which i can recharge with 8 cards from this deck. All at once including the Sunburst creatures for 4 mana or dealing combat dmg.
For the +1/+1-Counters Curse of Predation works faster to gain counters and can at some at non-Artifact creatures.
And for the Boost in +1/+1-Counters I can easily use the Corpsejack Menace for that and they gain them while entering the game which is much faster. Even if he cost twice that much he is a 4/4 creature and is there when i play the Sunburst cards.

Four cards for infinity combos seem to much to pull of in a match. Combine the "Duskmantle Guildmage" and "Mindcrank" you only need those two cards and have to deal damage or make an opponents card go to the graveyard (no matter how) and you win. And that combo also needs 3 mana to come into action ;) (but mostly just works at the fourth turn you play) I like "Returned Reveler" for the job to activate the chain because either he lose 1 life and loose the game or block and destroy it to let every oppenent of your loose the game. Other cards in the Deck should just be cheap discard or mill cards^^

hmm seems you're right. Would only make sense if you'd play to creat a copy token army made of him by using something like Twinflame

Djinn Illuminatus might be a great card to add in this because if you replicate those spells it might not halp the storm but it help to gain more Mana out of those cards + Gitaxian Probe will give you many cards to draw for your life as price to draw mana cards which you can Replicate to use storm ;)