  We introduce a semi-classical limit for many-body localization in the absence
of global symmetries. Microscopically, this limit is realized by disordered
Floquet circuits composed of Clifford gates. In $d=1$, the resulting dynamics
are always many-body localized with a complete set of strictly local integrals
of motion. In $d\geq 2$, the system realizes both localized and delocalized
phases separated by a continuous transition in which ergodic puddles percolate.
We argue that the phases are stable to deformations away from the
semi-classical limit and estimate the resulting phase boundary. The Clifford
circuit model is a distinct tractable limit from that of free fermions and
suggests bounds on the critical exponents for the generic transition.
