ImageMagick MagickWand API Formula was removed
Last version was

Revision: 2

php56-magickwand requires the following formulae to be installed:
autoconf 2.69 Automatic configure script builder
pkg-config 0.29.2 Manage compile and link flags for libraries
imagemagick@6 6.9.9-40 Tools and libraries to manipulate images in many formats

Recent formula history

ilovezfs php56: migrate to homebrew/core (#4835)
Jan Viljanen php: imagemagick rev bump
Andreas Braun Update revision for imagemagick-dependent formula
Andy Blyler php5*-magickwand: convert from sha1 to sha256
Andy Blyler fix style issues

Formula code at GitHub