Suppression Field
Enchantment
Activated abilities cost 
more to activate unless they're mana abilities.
The most feared of Azorius punishments is to be freed—sent back out into the world, stripped of all magical defenses.
John Avon
Rulings
Activated abilities contain a colon. They’re generally written “[Cost]: [Effect].” Some keywords are activated abilities and will have colons in their reminder text.
(wotc • 2016-06-08)
Suppression Field’s ability doesn’t affect static abilities, triggered abilities, or mana abilities. (A “mana ability” is an ability that produces mana, not an ability that costs mana.)
(wotc • 2005-10-01)
Rulings
Activated abilities contain a colon. They’re generally written “[Cost]: [Effect].” Some keywords are activated abilities and will have colons in their reminder text.
(wotc • 2016-06-08)
Suppression Field’s ability doesn’t affect static abilities, triggered abilities, or mana abilities. (A “mana ability” is an ability that produces mana, not an ability that costs mana.)
(wotc • 2005-10-01)