Azorius Traffic Enforcement [Unknown Event] Assassin's Creed Whenever one or more Dragons

Whenever one or more Dragons you control attack

Assassin spells you cast have freerunning {B}{B}

I see where you're going with that

Whenever a Dragon enters the battlefield under your control

it deals 5 damage to target creature or planeswalker an opponent controls

Azorius Traffic Enforcement [Unknown Event] Assassin's Creed Whenever one or more DragonsSet: Unknown Event Type: Creature Human Soldier Rarity: Common Creatures opponents control entering the battlefield don't cause backup abilities to trigger. At the beginning of your combat step, detain target creature with backup or vehicle an opponent controls. (Until your next turn, that permanent can't attack or block and its activated abilities can't be activated.)