Sprit Of The Forest is the most protective card among all other cards because of her abilities. Her 6 speed and flying ability makes her one of the hardest monster to take down. Advantages of playing with this card are :she gives 2 shield to all friendly monsters, she heals tanks, with snipe ability she will kill first opponent's monsters with low health which is big advantage over the enemy. When you use Sprit Of The Forest together with Brownie then it becomes almost impossible to hit this card even with high speed cards.
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From @smalien