Yisan, the Wanderer Bard is a rare Legendary Creature — Human Rogue Bard card from The List (PLST), collector number M15-209. Current market price: $1.38, TCGplayer market prices via Scryfall.
{2}{G}, {T}, Put a verse counter on Yisan: Search your library for a creature card with mana value equal to the number of verse counters on Yisan, put it onto the battlefield, then shuffle.