On the Omega Squad Teemo "Casualties of War" Bundle

So, looking at this legacy vault bundle, it seems that Omega Squad Teemo has gone out and killed: Annie, Alistar, Tristana, Amumu, Dr. Mundo, Gangplank, Corki, Caitlyn, Malphite, Heimerdinger, Gragas, Akali and Kog'Maw. So uh... I'm assuming these were kills that HE decided to make, not because he was ordered to, as he has killed Tristana and Amumu. And if Teemo did indeed kill these people and creatures of his own free will, I wanna know why and how. I mean, Malphite? How do you even kill that? He's a rock!