Trogmurr, Covered in Blood

As an aditional cost to cast Trogmurr, Covered in Blood, sacrifice a creature.
Trogmurr, Covered in Blood enters the battlefield with X +1/+1 counters on it, where X is equal to sacrificed creature's toughness.
"By ingesting a creature's blood, you may receive that creature's strength." - the Tome of Forbidden Knowledge