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"Catapult Turtle's" effect is Spell Speed 1 and is an Ignition Effect.
You can use this effect multiple times per turn.
"Catapult Turtle's" effect may be used once immediately upon summoning before the opponent may respond with an appropriate Trap Card like "Torrential Tribute" or "Trap Hole."
Tributing 1 monster is a cost. This effect is an Ignition Effect.
"Catapult Turtle" may Tribute itself for its effect.
The inflicted damage is equal to half the total ATK of the monster at the time it was Tributed.
"Catapult Turtle's" effect is based on the current ATK of the monster at the moment it is Tributed.
When you Tribute a face-down monster, the damage is equal to half the monster's original ATK while it is in the GY.
Face-down monsters may be Tributed for "Catapult Turtle's" effect.