I would go with fetches (a playset of Verdant Catacombs, but any fetchland with green or black will do, so you can consider Wooded Foothills, Polluted Delta, Bloodstained Mire,...) and definitely add Fatal Push, great to keep the board clear early game so you can hit opponents with infect.

You have a good creature list, but I would think about replacing some of the spells. Keep in mind you may or may not need some draw effects. I'd like to suggest moving Wild Defiance to your sideboard and putting in one or two Contagion Clasp tops (I think any more would be unnecessary). Vines of Vastwood was a great call! Didn't know it existed. Lastly I would take out the Mutagenic Growth for a full play set of Inquisition of Kozilek. IoK is a great disrupt card for anything black.

Thanks guys! I wish those damn fetch lands we're less expensive.. Lol . But I like those suggestions! Only thing I can't take out is those Mutagenic Growths. Those things have so much potential early and even end game as they can be played without paying mana. Theyre good to build off of stuff like Groundswell . Especially say turn 2, I can get the +4/+4 then get an extra +2/+2 for 2 life or even +4/+4 for 4 life and swing for 8-10 infect turn 2 or 3. All depending on card draw lol

Also just realized i forgot to update my sideboard on here too. Lol whoops! Ill get to that in a little bit

I'm suppriesd you aren't trying to run Inkmoth Nexus. flying is pretty strong. also Become Immense is pretty amazing later in the game

Oh i dont disagree with that. The only real reason I'm not is cost and my lgs not having any in. They both make this deck awesome. Become immense works real good with fetch lands. Its actually in my side board right now. Buuuuuutttttttt I'm broke. Maybe someday soon ill get those inkmonths!

Ok i know this is not fun & interactive, but if you add might of old krosa you could potentially win turn 2

Turn 1 forest and G elfturn 2 land and might + groundswell - getting the landfalltrigger you're now at 9 / 9, attack and finish with a mutagenic growth, using Life to pay for the cost. PS IDK how to make cards in blue text

Mutagenic Growth is nice and free, but what about Virulent Swipe? For you can get +2 twice. And in my mono black infect I am also runnig Phyrexian Vatmother for the boost.

Ok, I meant Hand of the Praetors not Vathmother :D

I like that black pump! Thanks for the suggestion! Now i experimented with Hand of the Praetors the only reason i took him out was because i found his cost was too high for how fast i wanted this deck to work. On turn 4 id rather be casting Groundswell, a Vines of Vastwood so i can swing for at least 9 infect rather than another creature. And now with that other one you mentioned that would make it 11 with a Plague Stinger !

I know you have Become Immense in your sideboard. What about Might of Oaks instead. cheaper mana cost and an extra +1 +1. Cool looking deck though.

Since this is infect, it's primarily aggro. Every turn you waste is a turn that a Death's Shadow will get bigger, a chance for a Delver of Secrets to flip, and another chance for a control deck to draw an answer. Infect is supposed to win before any deck can answer it. Most infect decks out there lose if they don't win by turn 3 because after that point it's burnt out its hand and the other guy drew removal. I would cut everything more than 3 mana and run a more aggressive aggressive mana base with fewer basics and more shocks and fetches because you don't care about the long game or the long game threats of opponents will create. If you're willing to add blue, I would recommend Blighted Agent. If not, then Apostle's Blessing is great because it's basically a 1 mana spell that makes your creatures unblockable under the right circumstances. I would cut Contagion Clasp, Thoughtseize, some of the Inquisition of Kozileks, and Phyrexian Swarmlord for more Fatal Push and pump spells. Beyond that, you should take a good hard look at every card on this list and ask yourself "How will this win me the game by turn 3-4 and is there a better alternative?" You only need 10 poison counters to lose the game so basically every creature you have does double damage in a sense. Just try to maximize the value you get from that basic idea.

Not to sound disrepectful, because i do value all input, but have you tried playtesting it at all? If you work the cards i have in here right you can pretty consistently win turn 3-4. Now of course you'll have the occasional bad hand or 2. But once this gets going its dealing at least 10 by turn 4. Now i have bogger cards in there like the Phyrexian Swarmlord because what happens if i dont get the turn 4 win? I dont want to be screwed and lose by default. I like to have even a little bit of back up as a kust in case. Now the hand disruption is vital in this deck. If first turn i get to see exactly what you have in hand i get to startagize how im going to play my hands to come out on top. But seriously I thank you for the input! My friend and i play in 2hg tournaments at our lgs and he runs a w/u control deck. He throws in the Blighted Agent as a wildcard they dont expect then i can pump him with green spells. Its actually a great combo the 2 decks!

If it hasn't already been suggested, Rancor would be really good should they have a bunch of blockers.

Deck looks excellent and a blast to play. Only thing i would change is just shuffling from side to main. I would take out one of your pumps (I would do Groundswell but its your call) to get the second Fatal Push in, and I would swap 1xPhyrexian Crusader and 1xPlague Stinger for your two Whispering Specter. Looks fast and nasty, glad its working out for ya!

I'd cut the Virulent Sliver as it works against your pump-and-smash plan because no matter how big it is it will only deal normal damage and leave behind a single poison counter. You could try something like Blossoming Defense instead.

Don't ask me how, but I somehow mixed up Blossoming Defense with Rancor. You should run Rancor over the sliver.

Damn i read that wrong! Thanks for pointing that out. Ill definitely have to look in to getting Rancor.

It has been a long ass time since I've played MTG and tried to be competitive, but back when I WAS one of the top 10 members of Tappedout, I played a lot of infect. A lot. So I can hopefully give some useful feedback.

Sideboard: Cut Flensermite, Phyrexian Swarmlord, and Whispering Specter. Swarmlord is tempting to include but in reality, it's a win-more card and ranges from moderately to very effective only when you're going to win anyways.

I'm not huge on Ichor Rats or Melira, Sylvok Outcast but they're at least good enough to warrant the possibility to be in your sideboard.

Mainboard: Any competitive infect deck needs 4 Phyrexian Crusader. It's such a good card. You may also want to consider another Inkmoth Nexus budget permitting. Also you want 4x Vines of Vastwood for protecting your stuff.

I don't think you need more than 4 hand search vehicles (Inquisition of Kozilek and Thoughtseize). Granted it almost never hurts to have more, but drawing one late game when you want a pump spell is an awful feeling that I've experienced personally. Of course, you'd want 4x Thoughtseize, but again budget permitting.

I'm also personally of the opinion that an infect deck does not need kill spells in it. Pump spells (like your sideboarded Become Immense) pretty much act like a kill spell if your creature gets blocked. If they don't block, your creature skates through and deals massive poison counters. A key to remember is that a pump spell draw late game wins you the game with an infect deck(especially with Rancor), and a kill spell does nothing to advance their poison counters. Inquisition or Thoughtsieze should allow you to get rid of any creature you don't like/can't deal with anyways, so that's why I think kill spells are moot.

Pen-ultimately, Livewire Lash was a card I used back in standard. It may be too slow now for Modern, but it's a way to deal poison counters without having to attack your opponent. Just pump and deal damage.

Lastly, if you are keeping your mana curve topping out at 3, you may want to also consider dropping to 21 land. It can be risky, but I would play test it anyways.

Hopefully this helps you somehow or can give you a bit of inspiration. I noticed you have a mill deck and I'll check that one too as I really want to make my current mill deck better.

Cheers.

Oh, also consider Abrupt Decay. For obvious reasons.

Pendelhaven is also amazing. Tap to boost your 1/1 creature FIRST before doing any combat tricks with spells.

I have Mono Green infect (Pauper type) I used Livewire Lash. It may delay turn but once equipped. You can kill you enemy by just pumping the creature or, swipe his creature then attack with pumped infect creature. You might wanna check it.

Thank you for the great suggestions! I added them before my fnm yesterday and used Pendelhaven and Livewire Lash multiple times for wins! You guys rock!

Chasko145 Good to hear for when I rebuild my own modern infect deck.

Looks like a solid deck, only thing I would recommend, depending on your local meta is adding Guttural Response

I feel like that would be a good side board for my meta. Honestly it's kind of all over the place for modern but having maybe 3 in there couldn't hurt. Thanks!