Shadowheart, Dark Justiciar is a rare Legendary Creature — Human Elf Cleric card from Secret Lair Drop (SLD), collector number 2483. Current market price: $17.12 (foil $17.75), TCGplayer market prices via Scryfall.
{1}{B}, {T}, Sacrifice another creature: Draw X cards, where X is that creature's power. Choose a Background (You can have a Background as a second commander.)