Ruin Disposal Dragon

:[Legion 20000]"Steam Knight, Puzur-Ili"(If your opponent's vanguard is grade 3 or greater, this unit may return four cards from your drop zone into your deck once, search your deck for the specified card, and Legion) :When this unit [Legion], choose one of your opponent's grade 2 or less rear-guards, and your opponent puts that unit on the bottom of his or her deck. :When this unit attacks a vanguard, this unit gets +2000 until end of that battle.