Yavimaya Dryad is a uncommon Creature — Dryad card from Time Spiral (TSP), collector number 235. Current market price: $0.25 (foil $4.74), 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.