Quick quetion aboout this cards effect

When horn is sent to the graveyard and its second effect activates can you choose to not use this effect or does the horn always get sent from the field to the top of ur deck??

thanks in advanced and sorry about all the one card questions threats i just started playin again and its hard to convince my brother about rules that arent in the rule book when they always seem to be at my advantage :p

Horn of the Unicorn's effect is not optional, it always goes to the top of your deck when it is sent to the graveyard. Due to the wording on the card there is no choice involved in this happening:

"Increase the ATK and DEF of a monster equipped with this card by 700 points. When this card is sent from the field to the Graveyard, it returns to the top of your Deck."

There's nothing wrong with asking questions when you don't know the answer. Although, before you make a new thread, you should always use the "Search" function to see if your question has already been asked and answered.

Thanks man ill do that