Card Rulings:Thunder Unicorn

OCG Rulings

 * The effect of ":" is an Ignition Effect that you can only activate once per turn, during your Main Phase.


 * Monsters Normal Summoned/Flip Summoned/Special Summoned after you activate the effect of ":" cannot attack.

Mentions in Other Rulings

 * Card Rulings:: The effect of ":" targets a ":" or a ":" in your Graveyard.