Indigo, Suffering's Mistress

When Indigo, Suffering's Mistress enters the battlefield, she does 3 damage to any target.
Whenever Indigo, Suffering's Mistress deals damage to a player, that player discards a card at random.
If you cast a spell with Cruelty without paying any mana, Lamentia, Suffering's Mistress has flying until the end of turn.