Rankle, Master of Pranks did not allow priority to pass to allow an instant - Abrade - before attacking.
After the first main and before assigning attackers for combat, my opponent played Rankle, Master of Pranks. I had two untapped lands - one a mountain - and no blockers available. The play went from flashing Rankle in through assigning damage before I got a chance to cast Abrade. This led to a state where the game was un-winnable, so I conceded. As far as I can tell, there was nothing on the board that should have prohibited me from casting Abrade before damage was assigned.
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