GX did a lot of things as far as reshaping the franchise's competitive metagame
The field spell is designed to recover the traps which I expect would get used a lot, and give me some breathing room if one of my Lethal Lords is killed and I'd normally be wide open for attack
...which lost in the first round of a tournament to a 14 year old running a combo deck with 40 land
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
If you experienced Ice Age yourself, what about the set do you remember most fondly
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