Forcing an opponent to pay life to stop you from looping some kind of trigger on a one-drop is great, and Athreos really rewards building decks that can do that since the opponent might otherwise be able to merely ignore your small creatures rather than having to try to kill them
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All of these were printed early on in Magic's lifetime - in Alpha, Beta, or Unlimited - before balance had been fully figured out
Itll even work on nonbasic lands, too
Read More: What is Prowess in MTG
Unlike videogames, which sometimes are structured in such a way that exclusion is built into the design, Wizards of the Coast employees have repeatedly demonstrated their commitment to fostering a welcoming community