2017-02-09 : Activated abilities are written in the form “Cost: Effect.” Some keyword abilities, such as equip and crew, are activated abilities and will have colons in their reminder texts.

2017-02-09 : An ability whose cost is simply {0} can be activated as many times as you’d like. Each activation causes Crackdown Construct’s ability to trigger.

2017-02-09 : An activated mana ability is one that adds mana to a player’s mana pool as it resolves, doesn’t have a target, and isn’t a loyalty ability.

2017-02-09 : Crackdown Construct’s ability doesn’t trigger if you activate an ability of an artifact or creature card not on the battlefield.