Wizkids Rules!

Minotaur: Paragon Humanoid Reads "When assigned to attack, Minotaur captures one opposing die of a lower level. This die remains captured until the capturing die leaves the field or uses the ability again."

It sounds like I'm able to capture an opposing die with each individual Minotaur die I use to attack. Is this a correct interpretation of the ability?

That is spot on, each Minotaur die can capture an opposing die (but only one).

-The Dice Masters Rules Team