A Reckoning Approaches is a common Scheme card from Archenemy: Nicol Bolas Schemes (OE01), collector number 16★. Current market price: $0.93, TCGplayer market prices via Scryfall.
When you set this scheme in motion, look at the top six cards of your library. You may put a creature card from among them onto the battlefield. Put the rest on the bottom of your library in any order.