Chill Pooch

Chill Pooch enters the battlefield tapped and does not untap during your untap step. Whenever Chill Pooch blocks a creature, tap that creature and put a Chillax counter on it.
Creatures with Chillax counters on them do not untap during their controllers untap step.
{3}: Chill Pooch can block this turn as though it weren't tapped.