Well I finally got the catalyst. The cost was huge but the worst part was the PVP triumph. At a 60:40 win/lose ratio expect to play around 30 matches. For those that hate PVP and don't raid... it's a big ask. Thats Bungie for you.
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To be fair, most raids (not sure about CoS) only require 1 run through with full gear to complete their triumph. I did Scourge yesterday and was getting just over 40% for wearing full Menagerie gear with Bad Juju as well, as that counts as a Leviathan exotic. Plus it's only encounters so you can always just hop in for a couple encounters every now and then if you have a team that can't get through it.