Kalina, the Intangible

Hexproof, indestructible
When five or more creatures are put into a
graveyard on any player's turn, return Kalina, the Intangible to your hand. Choose one or all.
• Exile target creature.
• Return target permanent to a player's hand.
• You draw a card, and lose 1 life.
{bull} Exile the top five cards of your library. Until
the end of your next turn, you may cast one or
all of those cards.