To be specific, this question refers to any non-exotic gear(as exotics will be upgradable), and for PvE/level advantge enabled PvP(ToO, IB, etc.)
For Me, it would be My Another NITC scout rifle, Broken Truth LR1 sniper rifle, Against All Odds machine gun, and all my hunter armor.
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You can still use things for normal crucible. Im keeping very few things however. Like the Messenger because theres no telling if it will ever be obtainable again