Activated abilities contain a colon. They're generally written "[Cost]: [Effect]." Some keyword abilities, such as equip, are activated abilities and will have colons in their reminder text.
14-03-2017
wotc
No abilities of artifacts can be activated, including mana abilities.
14-03-2017
wotc
Stony Silence's ability affects only artifacts on the battlefield. Activated abilities that work in other zones (such as cycling) can still be activated. Triggered abilities (starting with "when," "whenever," or "at") are unaffected.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.