Here's a suggestion for an Earth Splinter strategy that could get you through bronze. This might not work for line ups with rented cards as this just incorporates base cards.
12 Mana
Lyanna Natura>Stone Golem>Goblin Thief ADD ON Furious Chicken
15 Mana
Lyanna Natura>Stone Golem>Goblin Thief>Goblin Sorcerer ADD ON Furious Chicken
18 Mana
Lyanna Natura>Stone Golem>Goblin Thief>Goblin Sorcerer>Earth Elemental ADD ON Furious Chicken
22 Mana
Lyanna Natura>Unicorn Mustang>Goblin Thief>Goblin Sorcerer>Khmer Princess ADD ON Furious Chicken
25 Mana
Lyanna Natura>Unicorn Mustang>Goblin Thief>Goblin Sorcerer>Goblin Chariot ADD ON Furious Chicken
28 Mana
Lyanna Natura>Unicorn Mustang>Goblin Thief>Goblin Sorcerer>Goblin Chariot>Child of the Forest ADD ON Furious Chicken
30 Mana
Lyanna Natura>Unicorn Mustang>Goblin Thief>Goblin Chariot>Mantoid>Child of the Forest ADD ON Furious Chicken
Hope this helps :)
