If a Sprite with 5 power has 3 marked damage on it from Hextech, will it still deal full combat damage and kill both blocking units?

Ruling: Yes, the Sprite will still deal its full 5 damage in the combat damage step and can kill both blocking units. Marked damage does not reduce the amount of damage a unit deals in combat.

Sequence:

• Hextech resolves, leaving 3 marked damage on the Sprite
• Combat damage step occurs
• Sprite distributes its full 5 damage to blocking units
• Blocking units distribute 4 damage to the Sprite (only needs 2 more to kill it)
• Once all damage is assigned, units with damage equal to or above their power are killed

Nuances:

• A unit deals its full combat damage regardless of how much marked damage it has on it
• The Sprite only needs 2 more damage to be killed (since it has 5 power and already has 3 marked damage), but it still deals all 5 of its damage