Old Innistrad Werewolves have Daybound/Nightbound instead of their old transform rules. If they would enter on their 'night' side, any 'when this creature transforms to' effects become ETB effects. For example, if Huntmaster of the Fells would enter on its night side (Ravager of the Fells) it would deal 2 damage to target opponent or planeswalker and 2 damage to up to one target creature that player or that planeswalker’s controller controls as an ETB effect.