Matilda, Vampiric Seer

First Strike, Lifelink
Whenever a creature you control dies, you may
discard a card. If you do, draw a card.
As long as you have no cards in hand, you may
look at the top card of your library and cast it.
{r}{w}, discard a card: Matilda, Vampiric Seer,
deals X damage to any target, where X is the
discarded card's converted mana cost.