Eternal Witness
Once the Society of Mishra took control, the Tolarian Academy at Lat-Nam became a haven for dark research
Attack with it, exile cards from your graveyard, and then its prepared
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
1 Mankey: Aquapolis (Reverse Holofoil) $12.66 Another Mint-Tinged Monkey Aquapolis is beloved as one of the most popular vintage Pokemon sets ever, and most of its cards are incredibly difficult to find, especially in good condition
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