Does Ravenborn Tome increase the damage of Falling Star's reflexive triggers, making it deal 4+4 damage instead of 3+3?

Ruling: Yes, Ravenborn Tome increases each instance of damage from Falling Star to 4+4. The Tome adds damage to the spell, and the reflexive triggers still count as the spell dealing damage, even though they cannot be countered.

Nuances:

• The reflexive triggers are not spells themselves and cannot be countered with cards like Wind Wall
• The Tome explicitly states "each instance of damage the spell deals is increased by one"
• This is different from abilities that instruct something other than the card itself to deal damage (like Carnivorous Snapvine)
• Challenge damage would not be boosted because the units deal damage to each other, not the spell or ability