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You could discard it to pay a cost, because a spell or ability tells you to, or because you have too many cards in your hand during your cleanup step
That gets really out of control extremely fast, especially when you're making use of token generators like Young Pyromancer, Murmuring Mystic, and Talrand, Sky Summoner
Because you controlled the creature when it was exiled, it returns under your control for good
In theory, these extra-rare cards appear once every eight packs, so fingers crossed we pull a mythic here
The tokens are exact copies of the creature, so they retain its ability to duplicate further, meaning you get exponential growth if you can continue to draw extra cards