Nullify (all powers) with Aura (you have to buy the Duration up to Sustained and the Range to Touch) is 5 pp / rank for a Sustained or Permanent Aura, 6 pp / rank for Continuous. Now by default, that does only give you an Instant attack. Buying it up to Sustained costs 8 pp as above.
^_^ Just checked the math with Hero Lab.
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