Life for an Infect player is getting tough
If you can trigger an EtB ability every single turn, the best option in the deck (even better than Karumonix in the right situation!) is the rather unsuspecting Chittering Rats
He can come out quicker than Enforcer but to do so really hurts your ability to further your board
In November last year, it formed part of the Temur Floodcaller combo deck, a Standard strategy that - while it now only forms a small part of the meta - was briefly very popular, likely in part because it had the potential to pull off an infinite combo in the low-powered Standard environment
The scale used was determined to be accurate with .005 grams
There's probably some merit to that, however, I'd bet there's usually one player at the table who won't be filling their graveyard like crazy that can enable an easy flip