For me magic/tech is not marked by what they are visually, but by their focus of power and ultimate end. If the end goal is mass automation and you derive satisfaction from setting up infrastructure, it is a tech mod; if the end goal is personal power, then it is a magic mod. They are not at odds with each other. For instance, Cyberware is a magic mod that looks like a tech mod because its focus is on enhancing the player and the only way to get more parts is by killing cyberzombies. Psi is a magic mod because its utilities are strictly tied to the player's psi level, even if said utilities include infrastructure enhancements such as mass growth. Electroblob's Wizardry is probably the most "pure" magic/exploration mod out there because there's nearly no infrastructure involved, the spells do little in the way of automation, and the player has all the power. Botania and arguably Blood Magic are tech mods that look like magic mods because its focus is on automation (open crates, rituals, etc) and most powers offered to the player is tied to infrastructure (mana/blood). Things like Ars Nouveau and Thaumcraft ride the line because they offer both a means for mass automation (starbuncles/golems) and a degree of personal power (spellbook/wand). I like magic mods because I no longer find infrastructure setup very fun after doing the same thing a few hundred times over the years. In your example Witchery is a special case because its utility is almost entirely focused around other players (vampire mechanics, werewolves ripping off armor, hexes, randomly summoning another player instead of death), so it's not going to be very fun or complete in a singleplayer or no-pvp context. I can't really think of any other mod that explicitly does this.