Vidra, Pact-Bound Mage

: At the beginning of your upkeep, you lose X life, where X is 6 minus Vidra's loyalty. Vidra does not die for having 0 or less loyalty.
-1: Destroy target creature or planeswalker. You lose life equal to its converted mana cost.
-3: Create a 13/13 black creature token with "This creature gets -X/-X, where X is your life total."