Dreadhorde Arcanist [War of the Spark Prerelease Promos] Tiefling Bard Set: Outlaws of Thunder Junction

Set: Outlaws of Thunder Junction Commander Type: Creature — Ogre Rogue Rarity: Rare Cost: {3}{B}{B} Whenever another nontoken creature dies

or they shuffle another creature they own into their library

Set: Innistrad: Midnight Hunt Type: Creature — Spirit Rarity: Common Cost: {4}{U} Flash

Set: Commander Masters Type: Legendary Creature — Spirit Rarity: Uncommon Cost: {4}{B} Whenever a creature with power 1 or less is put into your graveyard from the battlefield

They are dead

Dreadhorde Arcanist [War of the Spark Prerelease Promos] Tiefling Bard Set: Outlaws of Thunder JunctionSet: War of the Spark Prerelease Promos Type: Creature Zombie Wizard Rarity: Rare Cost: {1}{R} Trample Whenever Dreadhorde Arcanist attacks, you may cast target instant or sorcery card with mana value less than or equal to Dreadhorde Arcanist's power from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead.