This creature gets +1/+1 for each other creature on the battlefield named Relentless Rats.
A deck can have any number of cards named Relentless Rats.

Relentless Rats

Secret Lair Drop

Each of them is a bad influence on the rest.

If you provoke them, they grow malicious.

If you exalt them, they grow splendiferous.

If you embolden them, they grow ambitious.

If you nourish them, they grow calamitous.