Aven Heartstabber [Streets of New Capenna]

Set: Streets of New Capenna Type: Creature — Bird Assassin Rarity: Rare Cost: {U}{B} FlyingAs long as there are five or more mana values among cards in your graveyard, Aven Heartstabber gets +2/+2 and has deathtouch.When Aven Heartstabber dies, mill two cards, then draw a card.