Cheapest priced copy (Mystery Booster 2): $3.99 at Card Kingdom, near mint, their price list as of .
Collector Ouphe 
Creature — Ouphe · 2/2 · Rare · Mystery Booster 2 · #66
Activated abilities of artifacts can't be activated.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
4 printings · $3.99 to $37.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Mystery Booster 2 | 66 | Rare | $3.99 | — |
| Modern Horizons | 158 | Rare | $4.49 | $37.99 |
| The List | MH1-158 | Rare | $4.49Out of stock | — |
| Secret Lair Drop | 1077 | Rare | $12.99 | $22.99Out of stock |
4 rulings from Wizards of the Coast
- 14 June 2019If 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.
- 14 June 2019No abilities of artifacts can be activated, including mana abilities.
- 14 June 2019Collector Ouphe's ability affects only artifacts on the battlefield. Activated abilities that work in other zones (such as cycling) can still be activated.
- 14 June 2019Activated 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.