Wyald, the Black Dog Knight

Cant block attacking creatures.
Whenever you sacrifice a creature, put a +1/+1
on Wyald, the Black Dog Knight.
At the end of your turn, if Wyald, the Black Dog Knight has 5 or more +1/+1 counters on it you
may transform Wyald, the Black Dog Knight.
Geez, talk about uncouth. Being bothered while I'm slaying or laying... ...pisses me off the most!