Once per turn: You can Tribute 1 monster; inflict damage to your opponent equal to half the Tributed monster's ATK on the field.
Rulings
Netrep Rulings
“Catapult Turtle's” effect is Spell Speed 1 and is an Ignition Effect.
“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.”
“Catapult Turtle” may Tribute itself for its effect.
“Catapult Turtle's” effect is based on the current ATK of the monster at the moment it is Tributed.
Face-down monsters may be Tributed for “Catapult Turtle's” effect.
WATER|
Level 5|[ Aqua / Effect ]
ATK 1000|
DEF 2000