This ability isn't great because it allows you to cast Equipment mid-combat... at which point the Equipment lands on the battlefield unattached and doesn't do anything. Trying to find a phrasing that allows you to use the equip ability without a million words is remarkably hard, though. I don't want her to just bypass mana costs entirely like Stoneforge Mystic.

One solution to that would be to replace her first ability with the Leonin Shikari ability. That'd replace one kind of synergy with her tap ability with another. It's not quite as good flavour - she's a brilliant designer, but not especially noted for quick work; Rakshata is behind the amazing midair equip moment in season 2. In fact, maybe I could steal that pair of effects for Rakshata, who doesn't have a card yet, and pair Cécile's current first ability with something else instead.

...Eh, or I could just leave it as is. It's fine to have a tap ability that's generally only useful at sorcery speed.