Eventually, I realized the blatantly obvious answer in Sky Pillar and I ended up taking Cinccino Mill with Sky Pillar to a Day 2 finish in Limitless Qualifier 3
Top chase cards include Cynthia's Garchomp ex #87, Ethan's Ho-Oh ex #86, Cynthia's Garchomp ex #91, Ethan's Ho-Oh ex #90, Arven's Mabosstiff ex #88, Yanmega ex #85
If the target changes from an artifact to an enchantment or vice versa, this still destroys it
Even outside of that use-case, Springheart Nantuko is a fantastic creature that can generate absurd amounts of value regardless of what you may or may not bestow it upon
In each booster pack, you will find 9 Common cards , 3 Uncommon cards , and 1 Rare or Legendary card