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Well, I don't have Isaac. I can offer Cogs or Toki-Tori for the key, if either of those would interest you. If not, then here's a bump.
I have plenty of games for sale for metal here: http://www.steamtrades.com/trade/PX0Lc/h-the-void-commandos-beat-hazard-more-games-w-tf2-metal-items-keys-or-game-offers.
Keys would be valued at 2.55 ref. Let me know what you are interested in! :)
Thanks.
I have the ability to buy one key