During the Main Phase: The turn player can activate this effect; excavate cards from the top of your Deck, up to the number of cards your opponent controls, and if you do, add 1 of them to your hand, also, after that, place any remaining cards and 1 card from your hand on the bottom of the Deck in any order. You can only use this effect of "Way Where There's a Will" once per turn. During the End Phase of any turn a player excavated 9 or more cards at once by this card's effect: That player can activate this effect; shuffle all cards your opponent controls and in their GY into the Deck.
