How do counters interact with Quirion Dryad and Unstable Mutation? Lets say I cast a mutation on a dryad. Does each -1/-1 counter added remove one +1/+1 counter that may be added down the road, and vice versa?
+1/+1 counters and -1/-1 counters annihilate each other one for one as a state based action. So a permanent that has both types of counters on it will end up having only one type.
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