Odin Card

Odin Card is an epic Triple Triad card.

Source
Odin Cards can be obtained as a drop in a duty or purchased from vendors.

Duties
Odin Cards can be obtained as a drop from the following duties:
 * Urth's Fount

Vendors
Odin Cards can be obtained during the Moogle Treasure Trove event by exchanging 7 with the following vendors:
 * Itinerant Moogle