RulingRules Reference 1.7

If while defending against an enemy attack, my identity takes damage from a “Boost” ability but takes no damage from…

Question

If while defending against an enemy attack, my identity takes damage from a “Boost” ability but takes no damage from the attacking enemy otherwise, can I still trigger Unflappable to draw a card?

Answer

Yes. The cost of the ability on Unflappable only requires that the defending identity take no damage during step 4 of the enemy attack.

— Rules Reference 1.7