The Disciple of Vess [Unknown Event]

Set: Unknown Event Type: Legendary Creature — Human Cleric Rarity: Rare Cost: {2}{B}{B} Whenever The Disciple of Vess attacks, you may put a planeswalker card from your hand onto the battlefield. If you don't, create a token that's a copy of a Liliana planeswalker chosen at random.(There are currently thirteen. Perhaps look up the list and roll a D20?) PERSON