Sorry, I can't remember the name of one of the cards I'm referring to here, but I believe it doesn't matter.
Card A -Subzero Defenses: Destroy the first enemy unit to strike against a friendly Hoth objective each turn, after it's strike resolves.
Card B - I can't remember, but the point is that it is a unit that has the sacrifice keyword on it.
So, if I attack with the unit with the sacrifice keyword on it, after it's strike resolves can I sacrifice it before Subzero resolves?