At time of writing, there are only two known commons that reward this unnamed mechanic: Arena Trickster, which turns from an unexciting Hill Giant into a Rampaging Baloth (and can continue to grow), and Naiad of Hidden Coves, which allows you to play two Vexing Gulls on turn four
If running recycling cards like Cyber Valley or Monster Reincarnation, or 2-for-1 exchange cards like Tribute to the Doomed and Raigeki Break, the AI will use the former to get back cards that are of no use to them while giving up more useful ones, and use the latter to get rid of a card on your field even if it isn't worth what they discarded
The surrounding walls are adorned with empty card shells
In addition to being economical, this provides a great form of protection for cards key to your flying-based strategy
Yes, thats right
By extension, her archetype is Fortune Fairy and Fortune Lady