Each one has a strong questing value that forces opponents to challenge or risk falling behind, and then once challenged and/or banished, their effects activate drawing you cards, forcing opponents to discard or return a character to their hand, and more
If you're worried about Boros struggling to draw cards, fret not: cards like Losheel, Clockwork Scholar and Tocasia's Welcome draw cards on both our turns and opponents, and then we've got mass draw heavy hitters like Neyali, Suns' Vanguard and Commander Liara Portyr to really pop off
It doesnt do much in EDH, however
Summon: Anima looks like a great 6-drop in any black deck, and it should help you to take over a game in short order
We dont have good enough textual traces for a word that emerges out of oral culture to find some kind of truth, but I think these origins point to the two different ways the gaming community, and especially MTG, use the term today
While some are easy to point to and find out, others still remain due to time