Hydragrum

If Hydragrum is destroyed, you may pay 2 health to return Hydragrum to the battlefield with -5/-5.
Each time you pay a health cost, grant Hydragrum +1/+1
"The Old Lord's blood spilt upon the snake, whose nature was to avenge. The world would pay for his master's spilt blood, for theirs would join it's scales as well" - Edict of the Old World 13:22