When exactly 1 monster you control (and no other monsters) leaves the field by an opponent's card effect (except during the Damage Step): You can banish this card from your hand or GY; if that monster is in the GY or banished face-up, Special Summon it, otherwise, Special Summon this banished card. If this card is Special Summoned: You can make this card gain 1500 ATK until the end of the next turn. You can only use each effect of "Doomstar Ulka" once per turn.