Land of the Titans
Land of the Titans is a card box in Duel Links that consists mostly of Earth attribute cards and a lot of Beast monsters. It's a very good card set for anyone running those two types of decks, but it has some good utility for other cards as well.
Some of the better cards in this set are definitely the Gearfried cards. Gearfried the Iron Knight and Gearfried the Legendary Swordsman. Of course you need the spell card Release Restraint to use Legendary Swordsman on Iron Knight, but it is also included in this set.

Land of the Titans Card Pulls
Green Baboon, Defender of the Forest
Yellow Baboon, Archer of the Forest
Talaya, Princess of Cherry Blossoms
Megarock Dragon
Gearfried the Swordmaster
Gearfried the Iron Knight
Dust Knight
Uniflora, Mystical Beast of the Forest
Obedience Schooled
Raging Mad Plants
Master Monk
Enraged Muka Muka
Grave Ohja
Flowerbot
Seed of Flame
Naturia Rock
Mogmole
Naturia Pineapple
Playful Possum
Nimble Musasabi
Amarylease
Plant Food Chain
Security Orb
Kangaroo Champ
Guard Dog
Monk Fighter
3-Hump Lacooda
Rodenut
Neko Mane King
Chu-Ske the Mouse Fighter
Legendary Black Belt
Kaminote Blow
The Big March of Animals
Release Restraint
Lighten the Load
Mind Wipe
Retort
Royal Surrender