Souls of the Lost LCI/369

Set: The Lost Caverns of Ixalan
Collector Code: LCI/369
Name: Souls of the Lost
Type: Creature — Spirit
Oracle text: As an additional cost to cast this spell, discard a card or sacrifice a permanent. Fathomless descent — Souls of the Lost's power is equal to the number of permanent cards in your graveyard and its toughness is equal to that number plus 1.
Rarity: Rare