When she returns, you'll attach Nim Deathmantle to her, and she'll make two thopter tokens
When enchanted creature dies, that creature's controller chooses a creature that this card could enchant
However, if you gift a card (letting your opponent draw a card), you get three target creatures instead
However, most effects that do this also allow you to cast the copy, and casting the copy will cause magecraft abilities to trigger.
Since many rats care about the number of rats you have, cards like Pack Rat, Ogre Chitterlord and Vren, the Relentless are enablers and payoffs for the strategy, creating rats that grow in sequence with one another
These are known for their velvety felt inside that gives each box a premium feel and may be easier on the edges of the cards you store in them