Forum:Do I need to shuffle the deck, or not?

With cards which allow you to bring back cards from play or from the graveyard and then place them in the deck, if it dosn't state to shuffle afterwards do you haft to? i.e.

Volcanic Recharge - Trap = ''return up to 3 'Volcanic' monster cards from your Graveyard to your Deck"

But it dosn't claim to shuffle afterwards so do you just put them where ever you like?

Also, with the monster/effect card "Volcanic Scattershot" = "When this card is sent to the Graveyard, inflict 500 damage to your opponent. If this card is sent to the Graveyard for the effect of a "Blaze Accelerator" card, you can send 2 "Volcanic Scattershots" from your hand / Deck to the Graveyard to destroy all monsters your opponent controls".

it says you can select monsters from your deck, i.e. you will be able to see what else is in your deck on which order it will be coming at your through drawing, do you not shuffle then either due to gaining an un fair advantage?

Please can some one settle this for me please

Thank you

Chris x