Card Rulings:T.G. Halberd Cannon

OCG Rulings

 * "This card cannot be Special Summoned except by Synchro Summon." is not treated as an effect.
 * The effect of negate the Summon of a monster is a Quick Effect, and can be activate during either player's turn.
 * "T.G. Halberd Cannon" can only negate the Summon of a monster that is Summoned through its own inherent Special Summon effect that does not start a Chain.
 * The effect of Special summon a T.G. monster Target 1 T.G. monster in your Graveyard.
 * The effect of Special summon a T.G. monster can be activate during the Damage Step.