If I reveal Pakaa Cub after my last unit is killed on the battlefield, does the cub become an attacker or a defender?

Ruling: You cannot reveal Pakaa Cub after your last unit dies because hidden cards are removed during cleanup when you have no units at the battlefield. You must reveal the cub before your last unit dies, and when revealed, it is designated as a "defender" when it joins the showdown.

Sequence:

• Reveal Pakaa Cub before your last unit dies
• The cub joins the showdown as a defender
• If you wait until after your last unit dies, hidden cards go to trash during cleanup

Nuances:

• You cannot reveal in response to something dying; you must reveal before the unit dies
• Hidden cards are removed as part of cleanup when you lose your last unit at a battlefield