Massacre Totem

At the beginning of the Horde's first main phase, reveal an additional card from the top of the Horde's library. The Horde casts that card. Hero's Reward — When Massacre Totem is put into a graveyard from anywhere, put the top seven cards of the Horde's library into its graveyard.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6oiyzqdp71pb1hhlngn1b0.