Tried to spice this build up with cards like Stagrandu, Fighter Dual Fang and a couple of Snares. Works great and can be quite devastating;
Fire: 11
4x Twin-Cannon Skyterror
2x Smash Warrior Stagrandu
2x Pyrofighter Magnus
1x Scarlet Skyterror
2x Searing Wave
Nature: 10
2x Fighter Dual Fang
4x Bronze-Arm Tribe
1x Rumbling Terrahorn
3x Natural Snare
Water: 11
1x Crystal Lancer
4x Aqua Hulcus
3x Aqua Surfer
2x Energy Stream
1x Crystal Memory
Multi Civ: 8
4x Gonta, The Warrior Savage
4x Wind Axe, The Warrior Savage
Total: 40
Fire: 11
4x Twin-Cannon Skyterror
2x Smash Warrior Stagrandu
2x Pyrofighter Magnus
1x Scarlet Skyterror
2x Searing Wave
Nature: 10
2x Fighter Dual Fang
4x Bronze-Arm Tribe
1x Rumbling Terrahorn
3x Natural Snare
Water: 11
1x Crystal Lancer
4x Aqua Hulcus
3x Aqua Surfer
2x Energy Stream
1x Crystal Memory
Multi Civ: 8
4x Gonta, The Warrior Savage
4x Wind Axe, The Warrior Savage
Total: 40