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Yikes, been there with the Scratching Post catalyst
Always have 400 rift coins just in case!
I'm doing this ASAP. 330 coins right now. I hope that nasty cat come back. :D
I save my rift coins purposely for that. I wait for the unique gold catalysts to show; those are the only ones I buy from the cabinet. It got me Scratching post and Darknut.
I recovered my rift coins, now I'll wait patiently for Frost Armor show up again.
I've tried saving my Rift Coins for it, but got unlucky the time Scratching Post showed up, because Frost Armor was there at the same time. It was a tough decision, and I'm still not sure I made the right one.