Ok as you look at the offers listed on the guy's unusual you can see some right in this range:

Purple Energy Noh Mercy (around 10.5+)

Moon Tossle (around 11.5+)

Scorching Tyrants (around 11+)

Moon Conneiseurs (around 10.5+)

Burning armored (not sure if current or not but this person may have retracted)

All of these offers are around my range I have setup and should be a good estimat for this unusual.