Effect
Once per turn: You can make this card's ATK 0, and if you do, Special Summon 1 "Umbral Horror" monster with 0 ATK from your hand.
The monster effect of "Umbral Ghoul" is an Ignition Effect. (This effect does not target.)
The effect "change this card's ATK to 0" and the effect "Special Summon 1 'Umbral' monster with 0 ATK from your hand" are treated as occurring simultaneously.
If you do not have an "Umbral" monster with 0 ATK in your hand, you cannot activate the monster effect of "Umbral Ghoul."
The ATK that became 0 due to its own monster effect remains 0 as long as "Umbral Ghoul" remains face-up on the field.
If the ATK of "Umbral Ghoul" is already 0, you cannot activate the monster effect of "Umbral Ghoul." Furthermore, if the ATK of "Umbral Ghoul" is 0 at the time its monster effect resolves, the effect to Special Summon a monster from your hand is not applied.
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