2019-06-14 : Activated abilities contain a colon. They’re generally written “[Cost]: [Effect].” Some keyword abilities (such as equip) are activated abilities and will have a colon in their reminder text. Triggered abilities (starting with “when,” “whenever,” or “at”) are unaffected.

2019-06-14 : Collector Ouphe’s ability affects only artifacts on the battlefield. Activated abilities that work in other zones (such as cycling) can still be activated.

2019-06-14 : If you control Collector Ouphe, you can’t activate any abilities of your artifacts, even if you’d sacrifice Collector Ouphe as a cost to activate one of those abilities.

2019-06-14 : No abilities of artifacts can be activated, including mana abilities.