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Its power comes from its combo potential

Undergrowth managed to capture the graveyard-oriented themes of the guild, but it failed to inspire that many interesting card designs

Beyond being a massive threat that can one-shot opponents, Blightsteel Colossus is also incredibly difficult to get rid of

Even if WotC owns the artwork by assignment, rather than as a work for hire (both possibilities were discussed in part one of this series), it is still unlikely that MTG art would fall under VARA protection, because the artwork as printed on cards, is not in a limited quantity and not signed by the artist (though the original works, like oil paintings, which the card arts are derived from, likely are protected under VARA)