A question we encountered when playing the LS challenge deck last night.
LS blocks our DS attack with SpecForces Commando. He wins the edge and kills the single attacking 2HP unit.
The question was how much cards does the Specforces mill?
2 because only 2 actual damage was dealt (because the remaining "overkill" fizzles) or 4 because the Specforces can deal 4 damage.
This has a big impact on the stategy to deal with Specforces.
If the "overkill" fizzles and doesn't increase the Milling power, it's more useful to harras the SpecForces with low HP units so they get focused for the ramainder of the turn and only 1 or 2 cards get milled.
If the SpecForces always do 3 or 4 Milling damage, it's better to hit them hard and fast with a 4+ HP unit to kill them ASAP.