Can Deflect stack, specifically with multiple Spirit's Refuge or with units like Fiora that gain Deflect conditionally?

Ruling: Deflect can stack as a keyword, but Spirit's Refuge specifically prevents stacking because it only grants Deflect "if they didn't already" have it. Multiple Spirit's Refuge in play will only grant Deflect once to buffed units.

Sequence:

• When multiple Spirit's Refuge are in play, layers require choosing an order for abilities to apply
• The first Spirit's Refuge grants Deflect to buffed units
• The second Spirit's Refuge sees units already have Deflect, so its condition is not met
• Result: buffed units only have Deflect x1

Nuances:

• The keyword Deflect itself can stack in general
• Spirit's Refuge's specific wording "if they didn't already" prevents it from stacking with itself
• Units with "While I'm Mighty I have Deflect" type effects use "have" wording for passive abilities, which may interact differently with stacking