Dark Supplicant is a uncommon Creature — Human Cleric card from Legions (LGN), collector number 64. Current market price: $0.34 (foil $19.26), TCGplayer market prices via Scryfall.
{T}, Sacrifice three Clerics: Search your graveyard, hand, and/or library for a card named Scion of Darkness and put it onto the battlefield. If you search your library this way, shuffle.