Rare Green
If one or more +1/+1 counters would be put on a creature you control, twice that many +1/+1 counters are put on that creature instead.
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Flavor:The Master discovered a new evolutionary path after tossing a human, a dog, and a cat into a vat of Forced Evolutionary Virus. He called his creations “centaurs” and unleashed them unto the wastes.