Unless I’m reading ti wrong, if Narcomoeba is triggered from the library (i.e. a free play when exiled), then it should reinforce existing Narcomoeba’s, right? In my limited testing, every time it triggered, I had to pick a creature to replace, and if I selected the existing Narcomoeba it grew to 4/4 and then immediately lost the reinforcement.
//Edited Title -Brigby