MPS promo symbol
Some of the MPS promos (particularly the Japanese ones) used an "MPS" promo set symbol. References are hard to find online but I think these might be usable:

<img width="49" alt="screen shot 2017-01-26 at 4 44 25 pm" src="https://cloud.githubusercontent.com/assets/221473/22351653/ef13fa86-e3e6-11e6-9d65-82cf11556120.png">
<img width="184" alt="screen shot 2017-01-26 at 4 44 56 pm" src="https://cloud.githubusercontent.com/assets/221473/22351655/f07b1846-e3e6-11e6-87f1-0eb312a5f289.png">
