While watching some of the Worlds videos, I noticed a serious misplay - pulling an SMC from heap back into grip - which not surprisingly played an instrumental role later in that game.
To see it happen, begin here:
1:06:56 - [Note that at this point the top card of runner's heap is Sure Gamble]. Corp has a big turn including loading then using an MCA Austerity. They then IAA something and give runner time to decide if they want to respond.
1:08:10 - The runner decides to use their SMC to pull Clot. (Corp player finishes turn...). [Top card of heap is now SMC]
1:09:15 - Runner's next turn begins. It's only 3 clicks because the MCA Austerity was loaded last turn. Runner uses Laguna to draw x3. They're now out of clicks, but understandably forgot about the MCA that is now in Archives.
1:09:32 - Runner attempts to install a pair of resources on a fourth click (using Hayley's ability to install the second), laying them out on the table. Corp player immediately catches this misplay and calls for a judge.
1:09:38 - Runner apologies for misplay, picks up the resources, says they will discard instead, and immediately discards a second copy of Laguna. [Top card of heap now Laguna]
1:09:42 - Corp says they'd rather consult with a judge, so - here is the misplay - Runner then picks up the Laguna they'd just discarded, and also the SMC. [Top card of heap is now Sure Gamble].
From here, they talk to the judge, conclude to play on, and so they do. Following is a bit more play by play which shows the impact that SMC has on the game (even though it's technically beside the point).
1:14:02 - Corp has a card installed in a remote behind one unrezzed ice, Runner has no breakers installed. Runner uses a DaVinci to play the SMC from grip, then plays stimhack to run that remote. Corp doesn't rez ice (the install in the remote was a bluff, just another Reversed Accounts), but then the Runner uses those stimhack credits with the SMC to install a Femme Fatale targeting the HQ ice. Time is called, Corp gets one final turn, but with Clot out they're not scoring anything.
1:17:03 - Runner's final turn, after time called. Corp has 2 points, Runner has 0 points. This final runner turn includes both an Information Sifting run on HQ and a normal run, unsurprisingly Corp doesn't rez the Femme'd ice for either of those runs. Runner steals a 2 point agenda from HQ on the second of these runs, for a tie.
That's the play by play.
I want to believe this is an honest mistake but ... it's SMC. It's such a pivotal card, I don't think I've ever looked at my grip and thought 'oh an SMC, where did that come from?'. No, I notice every draw, use, discard of SMC. Surely a Worlds competitor would too?