Cheapest priced copy (Ravnica: City of Guilds): $0.99 at Card Kingdom, near mint, their price list as of .
Suppression Field 
Enchantment · Uncommon · Ravnica: City of Guilds · #31
Activated abilities cost {2} more to activate unless they're mana abilities.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.99 to $14.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Ravnica: City of Guilds | 31 | Uncommon | $0.99 | $14.99Out of stock |
2 rulings from Wizards of the Coast
- 1 October 2005Suppression 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.)
- 8 June 2016Activated abilities contain a colon. They’re generally written “[Cost]: [Effect].” Some keywords are activated abilities and will have colons in their reminder text.