A year ago, I wouldn't have thought of featuring an Infect deck in this space. At that time, the deck had been one the best-performing archetypes in Modern for over a year, resulting in some clamor for a ban to halt the string of turn 3 wins, often with one or more pieces of protection.
Those pleas were answered when Gitaxian Probe was removed from the format earlier this year, and despite it being a powerful card, I did not expect it to sink Infect entirely. Unfortunately for Tom Ross and others, the deck has failed to make significant waves since the banning, although the printing of Fatal Push has contributed to that at least as much as the removal of Gitaxian Probe.
But as is often the case in Modern, archetypes lay dormant rather than die, and an updated version of Infect has put up some results in MTGO, with one notable addition: Disrupting Shoal.
The lesser-known pitch counterspell, Disrupting Shoal is perfect for countering cheap removal on the early turns, letting you tap out more aggressively than you otherwise would and thereby mitigating the deck's struggle with Fatal Push and other cheap removal spells.
To support Shoal, the deck plays a full eight one-mana cantrips, which also serve to fuel delve for Become Immense and let you consistently find the pieces you need. Spell Pierce also serves as a pitchable blue card, but this one also counters removal spells, completing a nice turn 2 sequence if you open with Noble Hierarch.
With all this effort invested in protection from removal, this version of the deck is less able to attack through blockers, making Glistener Elf a liability, so the former staple is gone and in comes Scars of Mirrodin Draft all-star Plague Stinger as the third part of the triumvirate with Inkmoth Nexus and Blighted Agent.
This version of Infect is slower than its predecessor, but given how much the format has slowed down this year, it's plenty fast enough for the current metagame, and now it has better tools to ensure that speed isn't just shooting from a glass cannon.