If Caitlyn has Tank, or if there are multiple units with Tank including Caitlyn, how do the damage assignment rules work?

Ruling: If Caitlyn has Tank, the opponent chooses whether to apply her Tank keyword or her "damage last" ability. If they choose Tank, they can assign damage to her first along with other Tank units. If they choose her ability, they ignore Tank on her and assign damage to her last.

Sequence:

• If Caitlyn has Tank and there are other Tank units, the opponent decides which effect to apply
• If they choose Tank: Caitlyn is treated as a Tank unit and can be assigned damage first (in any order with other Tanks)
• If they choose her ability: Tank is ignored on Caitlyn and she takes damage last

Nuances:

• Giving Caitlyn Tank actually benefits the opponent by giving them more flexibility in damage assignment
• If there are multiple Tank units (including Caitlyn), the opponent can assign damage to Caitlyn first by choosing to treat her as having Tank
• The opponent's choice between conflicting effects allows them to bypass either restriction