Navani Kholin

Navani Kohlin comes into play with 3 influence counters on her.
{t}: Remove an influence counter from Navani
Kohlin, add {1} to your mana pool. If Navani
Kohlin has no influence counters on her, return
her to your hand. You take 5 damage. If Navani
Kohlin would be put into a graveyard or exiled,
you take 5 damage. If you control The
Blackthorn, destroy all creatures.