Archenemys Charm Archenemy's Charms daunting mana cost means you cant play it much outside mono-black, but its worth contorting your mana base around
Theme decks (Mewtwo Mayhem and Pikachu Power) have minimal secondary market value despite being sealed
The usual rare version of her can be had for under $5
Not only do you get a sizable 2/2 for two mana, but you also get one of the best abilities put on a Rebel this side of the actual search mechanic
This hopefully smooths out the Limited environment, and it has two forms: Basic landcycling on a cycle of common creatures, one for each color (Cloudbound Moogle, Ice Flan, Malboro, Hill Gigas, Balamb T-Rexaur), and they each grab their corresponding basic
I didn't at first, because it was pretty generic and I wasn't super impressed by it when it was spoiled, but being able to mutate onto things like a Paradise Druid or a Gilded Goose when they're terrible top decks can be invaluable