With more people playing the game than ever before, the options for how you can play are nearly infinite
Originally when the set was handed off to me, common towns as lands were in the set but they did something different and were quite complex basically, they were lands with modal (meaning, pick one of three things) abilities when you played them
Similar to aura removal like Pacifism, you control your enchantment, even if it gets attached to another player's card
Sometimes the whole point of the errata is to correct a major oversight in its printed text, as was the case with Hostage Taker from Ixalan
Country maps can come from other FINAL FANTASY games
A second template was developed (when you cast your next instant or sorcery spell, copy that spell