Cid
Cid (Japanese: シド Shido) is a rare Support medal in Kingdom Hearts Unchained χ / Union χ.
Cid, when melded with a 6★ medal, reduces its deck cost by 1. A medal can have its cost reduced a maximum of 10 times.
Five Cid medals can be melded together to create a Cid 5, which will reduce a 6★ medal's cost by 5. Two Cid 5 medals can be melded into a Cid 10, which will reduce a 6★ medal's cost by 10. These 'stack' medals were introduced on March 17, 2016[1] as a space-saving measure.
You can obtain Cid medals through proceeding through the Coliseum, through certain Events or in Jewel Avatar Boards. Cid medals can be obtained as a bonus medal in Rare Draws during certain promotions.