Full Idea
By similar standards of reduction to Tarski's, one might prove witchcraft compatible with physicalism, as long as witches cast only a finite number of spells. We merely list witch-and-victim pairs, with no mention of the terms of witchcraft theory.
Gist of Idea
If listing equivalences is a reduction of truth, witchcraft is just a list of witch-victim pairs
Source
comment on Alfred Tarski (The Semantic Conception of Truth [1944], 04) by Hartry Field - Tarski's Theory of Truth §4
Book Reference
'The Nature of Truth', ed/tr. Lynch, Michael P. [MIT 2001], p.387