Found out about a stupid interaction. When {melira, sylvok outcast} enters the battlefield it removes infect from all creatures at that moment. When {inkmoth nexus} is activated and gains infect it retains tr ability even with melira on board due to time stamping. However infect damage is converted into -1/-1 counters and poison counters which cant happen with her out so in theory nothing happens though, technically "damage" is still delivered.
From {Melira, Sylvok Outcast} ruling on Gatherer:
"It's possible for a creature an opponent controls to gain infect after Melira enters the battlefield. For example, your opponent could cast Glistening Oil on a creature, and then Melira's ability and Glistening Oil's ability would be applied in timestamp order, with the most recent effect winning. The damage dealt to you by such a creature won't result in you losing life (because the creature has infect) or in you getting poison counters (because Melira stops them). Similarly, damage dealt to a creature you control by such a creature won't result in damage being marked on the creature or in -1/-1 counters. However, abilities that check whether damage was dealt (such as lifelink or Whispering Specter's triggered ability) will still see that damage."
So yes, if you were directly attacked by the inkmoth, you will lose no life. However it did do "damage". Similarily with {Platnium Emperion}.