Greenseeker is a common Creature — Elf Spellshaper card from Time Spiral Remastered (TSR), collector number 207. Current market price: $0.15 (foil $0.35), TCGplayer market prices via Scryfall.
{G}, {T}, Discard a card: Search your library for a basic land card, reveal it, put it into your hand, then shuffle.