If I use Ornn's Forge to discount gear on my turn, then pass it to my opponent, can I still use the discount on their turn?

Ruling: Ornn's Forge provides a passive discount (not an activated ability), so it applies automatically while you control the battlefield. The discount applies to the first friendly non-token gear played each turn, regardless of whose turn it is.

Sequence:

• The passive ability is always active while you control the battlefield
• When you play a non-token gear (including as a reaction on opponent's turn), check if it's the first one played this turn
• If yes, the discount automatically applies
• Once one gear has been discounted in a turn, the discount is exhausted for the remainder of that turn

Nuances:

• This is a passive ability (no colon in the text), not an activated ability, so you don't "use" it
• The discount can apply on either player's turn as long as you control the battlefield
• Playing gear as a reaction during your opponent's turn still counts for the discount if no other non-token gear was played that turn yet