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Works on both creatures and artifacts

One of these lands (Karakas) is banned in Commander, another (Pendelhaven) is properly rated, and two others (Hammerheim and Tolaria) have upside so narrow they arent really worth the effort

Similar to Interdimensional Web Watch, Goblins Shadow has a reasonable chance to see play in Commander decks that care about casting cards from outside the hand

Naturally, the inverse is true if you try to copy the big version as well

And when we do that, you have to look at the keyword in terms of how many meaningfully different cards it represents

Plus, there are many different engines you can set up with Grixis cards, with different gameplay options, and thats one thing I appreciate from a color combination