If it's just a matter of the cost of buying things up, then you could base Mind Control on Will. Or base it on a an IQ/H skill, as is done in Psionic Powers. (That will be cheaper than Will.)
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Originally Posted by Humabout
The rule of 20 is for Spells, iirc.
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The Rule of 20 (B173) is for skill defaults (which are based on a max of 20 if the base attribute is higher).
The Rule of 16 (B349) is for resistance rolls, and limits the attacker's effective skill to the max of the defender's resistance or 16. The text says "supernatural attacks" and cites both magic and psi (along with "etc") for context, so it would clearly apply to Mind Control of Kilgrave's sort.