polyschematist

from The Century Dictionary.

• Characterized by or existing in many forms or fashions; specifically, in ancient prosody, admitting as substitutes feet not metrically equivalent, or containing such feet.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Having, or existing in, many different forms or fashions; multiform.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective polyschematic
• noun polyschematic poetry