The Swift Shorestrider is obtained from the Throne of the Tides TCG expansion set, from the "Wasteland Tallstrider" card. Once the card's code is obtained, it can be redeemed in-game with Landro Longshot at Booty Bay.
A rarity amongst the tallstrider breeds of Kalimdor, but easily recognized by its pungent dead seaweed aroma.
Patch 8.1.5(2019-03-12): Model updated, re added orange belly.
Patch 8.1.0(2018-12-11): Model updated, lost its trademark orange belly.