Does Sivir, Battle Mistress trigger when Twisted Fate, Gambler's attack trigger recycles a rune from the top of the rune deck?

Ruling: Yes, Sivir triggers when Twisted Fate recycles a rune from the rune deck. Recycling a rune counts regardless of where it's recycled from.

Nuances:

• The game recognizes cards in the rune deck as runes even when they are hidden information, as evidenced by Twisted Fate's wording "reveal the top rune of your rune deck, then recycle it"
• This differs from "unit" which specifically refers to unit cards on the board as permanents, not unit cards in other zones
• There is no equivalent rule for runes that differentiates them when on the board vs in the rune deck (unlike units and gear)
• The ability looks for the game action (recycling) and card type (rune), not the zone the rune is recycled from