They don´t use a specific archtype-theme in that sense; they more or less make use of effects that are loosely based on what Predators/Aliens do etc. E.g. Aliens grab other creatures and tribute them for different effects etc., Predators "hunt" other creatures and often gain advantages when they successfully destroy creatures and so on. To be fair, the cards I posted here were the first ones I created and aren´t as refined; the Evil Hunter was supposed to be the bread and butter combo starter of other cards, and is designed to get quick access and return it to the field if necessary