Sliced in Half, Samurai Sword

【CONT】 If you have 2 or more "Swift Slash, Samurai Sword" in your waiting room, this card gets -1 level while in your hand. 【AUTO】 [Put 2 green cards from your hand into your waiting room] When this card attacks, this card gets +4000 power until end of turn, and you may pay the cost. If you do, your opponent puts the top 18 cards of their deck into their waiting room. 【AUTO】 [(1) Put 1 "Swift Slash, Samurai Sword" from your waiting room at the bottom of your deck] At the beginning of your opponent's main phase, you may pay the cost. If you do, this card cannot become 【REVERSE】 until end of turn.