Spelldrain Assassin is a mythic Creature — Vampire Assassin card from Alchemy: New Capenna (YSNC), collector number 29.
When Spelldrain Assassin enters the battlefield, choose an instant or sorcery card in your hand. It perpetually gains casualty 2. (As you cast this spell, you may sacrifice a creature with power 2 or greater. When you do, copy this spell and you may choose a new target for the copy.)