You can send 1 Plant-Type monster from your hand or face-up from your side of the field to the Graveyard; choose 1 "Sylvan" card from your Deck and place it on top of the Deck. You can only use this effect of "Mount Sylvania" once per turn. Once per turn, during your opponent's End Phase: You can excavate the top card of your Deck, and if it is a Plant-Type monster, send it to the Graveyard. Otherwise, place it on either the top or bottom of your Deck.
Sends from field to Graveyard for cost / Sends from hand to Graveyard for cost / Sends from your Deck to your Graveyard / Changes Deck order / Adds from Deck to Top of Deck / Excavates / Sends excavated cards to the Graveyard / Places excavated cards on the top of the Deck / Places excavated cards on the bottom of the Deck