"Summer Camp"

 The “Summer Camp” series was first introduced in May 2011. They have a yellow border and 110 total cards: 45 common cards, 55 foil cards, 10 story cards.

This series focused on summer camp, and introduces various monuments, and the different sleeping spirits.

Horses With a Herd
This list is based on the official U.S. checklist.
 * Addis
 * Applejack
 * Arizona
 * Arroyo
 * Aspen
 * Bella
 * Bronco
 * Eagle
 * Emberic
 * Farah
 * Firefly
 * Hickory
 * Hoss
 * Juniper
 * Lightning
 * Maplewind
 * Mustang
 * Notos
 * Oakley
 * Ponderosa
 * Potpourri
 * Rio
 * Rocky
 * Ruskin
 * Shamal
 * Smokey
 * Sumarr
 * Sundown
 * Wildflower

Promo Cards
These are horses that were included in promo images or cards, but were never officially released in this particular series.
 * Eastrin Mustangs
 * Westro Mustangs