Poop

When Poop enters the battlefield, choose a
creature.
Whenever target creature attacks put a poop
counter on target creature.
For each poop counter on a
creature, that creature gets a -1/-1 while attacking.
{x}{g}{t}: X equals the number of poop counters already on the battlefield.Put a poop counter on a creature that doesn't already have one.
"Aw poop"