Banjo Bayou - 2

Strategy
Witch Doctor will gains bonus attack damage while the Rage Chili fills up. Not only that, he will also block the target's received healing. You should Protect the target with Red before he did that and when he blocks you, use Matilda's rage ability to heals target and cleanse the block.

Choose Matilda in Druid, Bomb in Cannoneer and Red in Samurai. Heal with Matilda if the birds' healths are not full and if they're full, attack with her. Then attack with the others. Use the Rage Chili on Matilda when it's full if the birds' healths are under 70%, otherwise, use it on Red when it is full. Don't forget to use Red's secondary skill when Witch Doctor is about to attack. Repeat this over until you win or either lose.

In Summary
Voodoo Berserker can heal 50% of his health, and Witch Doctor can reduce healing by 100%.