Wereth, the Spookcat

Wereth can't be countered.
Predation {1} (Whenever this creature attacks, instead you may pay {1} and tap it. If you do, it deals damage equal to its power to target creature.)
Whenever Wereth becomes tapped by any creature's ability, put a +1/+1 token on Wereth.
Curiosity killed the cat, and satisfaction brought it
back for more.