Does damage clear during cleanup after each item resolves on the Chain, specifically between playing a damage spell and attacking with a unit?

Ruling: Damage does not clear during cleanup after items resolve on the Chain. Damage only clears at the end of combat and at the end of turn.

Sequence:

• Play a damage spell (e.g., Super Mega Rocket) dealing damage to an opponent's unit at a battlefield
• The damage remains on that unit
• Send in a unit to attack that same damaged unit
• The opponent's unit still has the damage from the spell during combat

Nuances:

• This means you can stack damage from spells before combat, making pre-combat damage spells more valuable than if damage cleared between Chain resolutions