Card

Collector Ouphe

Mana cost {1}{G}

Activated abilities of artifacts can't be activated.

Part of 6 known combos, one of them two-card. 4 official rulings.

Bracket

B1 Exhibition — Not in the same deck as its two-card combo partner: Mycosynth Lattice
B2 Core — Not in the same deck as its two-card combo partner: Mycosynth Lattice
B3 Upgraded — Not in the same deck as its early two-card combo partner: Mycosynth Lattice
B4 Optimized — allowed: No restriction beyond the banned list
B5 cEDH — allowed: No restriction beyond the banned list

Bracket: Lotus Vault analysis, with Commander Spellbook flags

6 known combos, one of them two-card.

Mycosynth Lattice + Collector Ouphe
Produces: Activated abilities can't be activated, Lock, Mass Land Denial
View on Commander Spellbook
Lethal Vapors + Mycosynth Lattice + Collector Ouphe
Produces: Destroy all creatures that enter the battlefield, Activated abilities can't be activated, Lock
View on Commander Spellbook
Aether Storm + Mycosynth Lattice + Collector Ouphe
Produces: Activated abilities can't be activated, Players can't cast creature spells, Lock
View on Commander Spellbook

2019-06-14 · Wizards of the Coast
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 · Wizards of the Coast
No abilities of artifacts can be activated, including mana abilities.
2019-06-14 · Wizards of the Coast
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 · Wizards of the Coast
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.

Rulings: Scryfall · Wizards of the Coast