How does Caitlyn's card work? Does she deal and receive damage at the end of combat, or only one? Does moving her to a battlefield and tapping trigger her ability?

Ruling: Caitlyn has two abilities. The first is a passive that makes Caitlyn always the last of your units to die when assigning combat damage. The second is an activated ability that requires paying a cost to use.

Nuances:

• Moving Caitlyn to a battlefield and exhausting her does not trigger her effect because it is an activated ability, not a triggered ability
• You must pay the cost to activate the second ability