Augur of Autumn is a rare Creature — Human Druid card from The List (PLST), collector number MID-168. Current market price: $0.46, TCGplayer market prices via Scryfall.
You may look at the top card of your library any time. You may play lands from the top of your library. Coven — As long as you control three or more creatures with different powers, you may cast creature spells from the top of your library.