Yavimaya Dryad is a uncommon Creature — Dryad card from Archenemy (ARC), collector number 75. Current market price: $0.23, TCGplayer market prices via Scryfall.
Forestwalk (This creature can't be blocked as long as defending player controls a Forest.) When this creature enters, you may search your library for a Forest card, put it onto the battlefield tapped under target player's control, then shuffle.