Orc champion, Uncommon, 32r
Horde, Banish
Attack: 21 + N (N = total cost of opponent's discarded cards, max 35)
It's unique, but I have a feeling it cannot be implemented as it is. The Attack value will have to be resolved during the card effect phase of turn actions, before the keyword effects occur. Unless the keyword effects were hard-coded into the card effect, I can't see how to make this work with the system as it is now.