Mutant Genesis: For the Mutant Genesis card “Homo Superior”, does it still surge if it attaches to a minion that is already…

Question

For the Mutant Genesis card “Homo Superior”, does it still surge if it attaches to a minion that is already tough. I’m trying to figure out if “otherwise” is conditional to part or all of the preceding sentence, as it doesn’t read well to me if part of the effect (attaching to a minion) can be fulfilled, but it says “otherwise.” My interpretation is that it only surges if no minion is available to be attached, but I’m looking for clarification.

Answer