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Its a three mana Green Enchantment that doubles the value of X on any permanents you cast with X in their mana cost, and copies any abilities, Instants, or Sorceries with X in their mana cost
The team who tackled that work in Modern Horizons 2 was headed up by Creative Manager Tom Jenkot and Senior Creative Director Jess Lanzillo
Still, it fits my criteria of being an older rare and has a surprisingly useful effect
Heritage Druid might be the way the Elves deck breaks it, but I could see a world where you play Glimpse of Nature and a bunch of free artifact creatures
There are plenty of non-tribal spells which simply fit into what your deck does, like Dragon Fangs and Dragon Tempest for Karrthus, or Rooftop Storm, Army of the Damned, and Zombie Apocalypse for that Zombie deck