[LV1][LV2][LV3] (When Attacks) When only the opposing Spirit is destroyed by BP comparison, draw two cards from your deck.
[LV3] (When Attacks) When the opponent's life is reduced by this Spirit's attack, by destroying this Spirit, summon one card whose name contains "Imago" from your hand, without paying the cost.
"Decreased by attack" means an unblocked attack which decreased the life, not any effects which might have activated during the attack (Such as The BladeWolf Beo-Wulf) .