Canyon Land - 3

Strategy
Warning:  The Frostpig can block your rage ability and Ice Shaman can steals your received healing. To cleanse those harmful effects, after Frostpig or Ice Shaman attack, use The Blues' secondary skill immediately on all birds.

Choose Matilda in Druid and Bomb in Cannoneer and The Blues in Tricksters. In every waves, attack every turn with The Blues and Bomb, then, heal with Matilda if the birds' health is not full, otherwise, attack with her. At wave 2, you need to knock out the Frostpig first. Don't worry about the Ice Pigmies' Hoard power, just keep defeating them after you have defeated the Frostpig. At wave 3, knock out the Ice Shaman first, then the Chieftain and finally the Ice Pigmies. Repeat this over and over until you win the entire battle or lose the entire battle.

On the first wave, don't use the Rage Chili to anyone. Use it for The Blues at the second wave (once only) and for The Blues at the third wave if the birds' healths are over 65%, otherwise, use it for Matilda.

In Summary
The majority of pigs can remove helpful effects, and heal their friends too.