Warden of the Deep

Skulk, Menace, Swampwalk
Place a noise counter on this creature every time a player casts a spell or uses an ability.
This creature cannot attack unless a player cast a spell or used an ability last turn.
{t}, Sacrifice X noise counters: Target creature takes
X damage.
This creature’s power and toughness is equal to the number of nonartifacts in target player’s graveyard.