When do units get healed from damage?

Ruling: Damage heals from all units in play at the end of combat and at the end of turn, regardless of whether they were in combat or how they received the damage.

Nuances:

• Spells are not combat; combat is specifically when opposing players are at the same battlefield contesting it
• Units heal even if they weren't in combat
• Units heal whether damaged by combat or by spells