Effect
Cannot be Normal Summoned, unless you control a "Ghostrick" monster. Once per turn: You can change this card to face-down Defense Position. When this card is flipped face-up: Inflict 100 damage to your opponent for each Set card on the field. You can only use this effect of "Ghostrick Warwolf" once per turn.
"Ghostrick Warwolf" can only be Normal Summoned in face-up Attack Position if you control a face-up "Ghostrick" monster.
The monster effect "Once per turn, you can change this card to face-down Defense Position" is an Ignition Effect. (It does not target.)
The monster effect "When this card is flipped face-up: Inflict 100 damage to your opponent for each Set card on the field" is a Trigger Effect that must be activated when "Ghostrick Warwolf" itself is flipped face-up. (It does not target. It also activates during the Damage Step.)
The monster effect "Inflict 100 damage to your opponent for each Set card on the field" inflicts damage to your opponent equal to the number of Set cards on both fields at the time the effect resolves.
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