Once you get to copying, you can finish things off with some infinite combos or just Crackle with Power twice
Nothing in this drop is particularly big monetarily, but it is full of famous callbacks to the movie
Then you can cash it in to deal a huge chunk of damage to any target
It kills any creature with mana value 2 or less, or goes up to 4 mana value with revolt, easily triggered by fetch lands or Treasure
Eternal Witness
And thus, Emerald Charm was a handy solution to any global enchantments (for you younglings, those enchantments which don't enchant anything in particular, such as Form of the Dragon or Worship), a way to bring flyers down to earth, and a second use of a utility creature, all wrapped into one neat little charm