Descendants' Fury is a rare Enchantment card from Commander Masters (CMM), collector number 766. Current market price: $1.47 (foil $2.35), TCGplayer market prices via Scryfall.
Whenever one or more creatures you control deal combat damage to a player, you may sacrifice one of them. If you do, reveal cards from the top of your library until you reveal a creature card that shares a creature type with the sacrificed creature. Put that card onto the battlefield and the rest on the bottom of your library in a random order.