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As far as convoke abilities go, Im not sure it fits well with the flow of decks that use extraction effects

In this deck, it allows you to play The Twelfth Doctor who certainly is strong with a variety of demonstrated cards and get another spell off the demonstrate trigger

But if you insist There are no lands matter Commanders in mono-black

They might have a connection and the Duelist may value it

Ive got a really nice error to show as well, but Ill be posting that in my collecting thread in a few weeks 5 Likes elam18 March 17, 2017, 3:25pm 4 I bought a card from @garyis2000 where he trimmed the edges of a Holographic Blastoise to make it into a square cut and where he used an eraser to erase the 2 out of the stage 2 pokemon 6 Likes fourthstartcg March 17, 2017, 4:28pm 5 I have this funny error card