This card cannot be activated when you take damage from cards activated as Chain Link 2 or higher.
Increasing your Life Points and inflicting damage to your opponent resolves at same time. ("then you can add 1 "Saber" Spell/Trap Card or 1 "Gottoms" card from your Deck to your hand." effect does not resolve at same time.)
Increasing your Life Points and inflicting damage to your opponent is mandatory, but adding a card from your Deck to your hand is optional.
This card can be activated even if the effect of "Thunder King Rai-Oh" is being applied or you do not have cards to add from your Deck to your hand. In that case, only the "Gain LP equal to the amount of damage you took, also inflict an equal amount of damage to your opponent" effect is applied.