It might sound odd saying this, but Tainted Strike is the best card in the deck. First off attacking with Prossh, sacrificing the six Kolbolds, then TSing for 12 infect is an obvious use. It can also be used defensively to negate a creature's attack for 8 or less (assuming you are the only infect player). Lastly, you can do this to other people's creatures to either turn the tides of battle or surprise an opponent with an infect KO from out of the blue.
I would like to address the elephant in the room about the price of some of the cards. Some of these cards I got as gifts or from trades. Others I grabbed back during a time no one thought these cards were good (pre-commander hype). Many of these I got simply from being handed the right packs to open from store clerks. Regardless I never recommend net-decking 100% from just one deck, as some cards might be out of your price range or even useless to you with your meta. I NEED Unravel the Aether in my deck because of my playgroup running so many indestructible permanents in their 99. Most normal people would rather run Naturalize, Krosan Grip, or the new Return to Nature. Search up other similar decks on this site from different users, or try EDHREC or mtgGoldfish to see what would work best for you and your meta.
I've still not tested Galvanic Punch nor Domri's Ambush just yet and will upgrade this decklist as needed.
I used to run Ogre Menial in the deck, the red mana was just never there to make it work.
As with all my decks, your comments are welcome!