For example, if you control The Ozolith ("Whenever a creature you control leaves the battlefield, if it had counters on it, put those counters on The Ozolith.") when Sin's last ability resolves, you'll put the appropriate number of each kind of counter onto both The Ozolith and the target creature
The Thief lets you draw then discard a card when one of your creatures deals damage to an opponent or you draw three with a full party

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I guess you never want to challenge with her any way, since her value is in her ability, which triggers off of questing
It's great for established TCG players