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Deathrite Shaman can use his mana-producing ability without any problems, it's working.
As for his other 2 abilities, he pretty often does not "see" instants/sorceries and especially creatures in graveyards (when i click on him there's no option to use the "lose 2 life"/ "gain 2 life", despite for creatures and instants/sorceries being in graveyards).

Well, I slightly corrected the code, but it's still a really complex card. Consider it fixed.