Command the Dreadhorde is a rare Sorcery card from War of the Spark (WAR), collector number 82. Current market price: $0.54 (foil $1.48), TCGplayer market prices via Scryfall.
Choose any number of target creature and/or planeswalker cards in graveyards. Command the Dreadhorde deals damage to you equal to the total mana value of those cards. Put them onto the battlefield under your control.