in addition to casilla turning two, the card is significant because it shows the memorial patch (a microphone with the name 'herb') that the twins wore during the 2007 season for their longtime radio broadcaster herb carneal. carneal joined the twins' broadcast team in 1962, and worked through the 2006 season although his workload had diminished by that time. he was the recipient of the ford c. frick award in 1996, and the twins' press box had been named in his honor in 2001. counting his work with the a's, phillies, and orioles prior to joining the twins, carneal had a 51-year career in baseball broadcasting.
the 83-year old carneal died of heart failure just a day before the 2007 season began, and the twins wore black armbands in his honor for the opener. i couldn't find a card with the armband, but here's a getty images photo of justin morneau wearing the armband.
here's a 2008 upper deck sp authentic card of morneau showing the patch that was developed soon after
and here's the other half of the twins' version of the m&m boys, joe mauer, who is also displaying the patch on his 2008 upper deck sp legendary cuts card