The upgrade kicks in when you have both an instant and a sorcery in your graveyard, at which point you get to keep two of the three cards you see
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It needs a lot of little sacrificial dorks to be reliable like Tinker needs artifacts and so you really shouldn't be running both in the same deck, either or both will have no support and will likely be uncastable early when they are most powerful
Magic: The Gathering has several archetypes that become a target for the group, like Slivers and Eldrazi
It might see some play, but it doesnt impress me too much
They primarily give permanents keywords like protection, indestructible, and hexproof, though the best of them phase out your permanents