Yup, it's the Cards promotion. If you find all the cards containing divine tack, one of your horses becomes Tormenta, the new Legendary divine.

Does anyone have a picture of all of the Legendary horses? I know what Amira and Altair one other that I forgot the name of looks like, but what about the others?

Tormenta is a legendary horse.

You can obtain her when you give the 5 pieces of Tormenta's legendary tack to one of your horses, or when you purchase a Tormenta pack.

On certain days, she can complete 2 missions. Upon completing the second daily mission, she gives a 10% training bonus in one skill to all your horses.

When Tormenta is obtained via the Tormenta pack, the probability that she can take on two missions a day is higher.
Game:
gives a 10% training bonus in one skill to all your horses if she completes 2 missions on the same day
VIP:
Automated retrieval of items crafted in workshops (except for buildings)

This mare cannot be sold.


Zaldia is a legendary horse.

It is obtained when you equip one of your horses with 5 Zaldia legendary equipment , or when buying a pack of Zaldia .

Some days it can be healed *I believe this means groomed* twice. When dressed for the second time of the day , it saves you a diamond on your next purchase of pass if it takes place before the end of the day.

When Zaldia is obtained through the pack Zaldia , it accepts most often be dressed twice a day.

Game:
saves a diamond at the next purchase of pass the day she is dressed twice. *Not sure what this means, I think it might be she either gives you a diamond OR if you spend a pass, you'll get a diamond (or using Diamonds, it would only cost 9 instead of 10) - we;ll have to wait and see.

VIP:
Reserve access to the equestrian center in a particular jurisdiction to the choice instead of skills

This horse can not be sold.


Bucephalus

Basically each day you log in you get some free cards, and then by doing some small tasks (like winning first in a comp) you can also win cards. There is a max of free cards a player can win a day.
You can also purchase cards in the flash sales (which can get pretty expensive), and later there are usually card pack that can be bought with passes.
The goal is to collect all the cards. Some group of 5 cards offer more expensive BMIs, and the final 5 card collection is the divine/legendary that is being offered.
Some cards do not belong to the 5 card offers, but instead immediately give you the gift.
It is possible to get the legendary horse before collecting all the possible cards.
In my forum I have a larger topic under promo spoilers that explains the next round of cards coming up (what they look like, what they offer, ect.)

Zaldia

Any ideas when the card promotion is going to begin? I was thinking Monday at 1pm?

Do you happen to know when the cards are going to start?