Forum:Wave Motion Cannon

Me and my friend were having an arguement about wave moition cannon's effect." During your Main Phase, you can send this card to the Graveyard to inflict 1000 points of damage to your opponent for each of your Standby Phases that have passed since this card was activated"

First off: is this card forbidden in any way shape or form?

The question/arguement was: do you need to use a card like "mystical space typhoon" to send this card to the graveyard, or do you automatically send this card to the graveyard due to the card's effect.

Next: when this card is in the graveyard because of it's effect: basically my opponent's life points get hit badly after each turn?

thanks