Sporogenics infection player selection isn’t obvious so new players often burn the rope. Whilst this is annoying I think a far worse interaction happens, the default logic for the card is to always sacrifice your own permanent regardless of what creature it was applied to. It’s quite hard to infer player intent but in limited formats most of the time it’s being cast on the opponents creatures and I want them to sacrifice another creature.

Both points above effectively cost me a game, it’s both in culmination that make it prone to error.