Selvala's Stampede is a rare Sorcery card from Tarkir: Dragonstorm Commander (TDC), collector number 269. Current market price: $0.34, TCGplayer market prices via Scryfall.
Council's dilemma — Starting with you, each player votes for wild or free. Reveal cards from the top of your library until you reveal a creature card for each wild vote. Put those creature cards onto the battlefield, then shuffle the rest into your library. You may put a permanent card from your hand onto the battlefield for each free vote.