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In this case, its because that mana can only be spent to cast artifact

Optional Inclusions: Ultimate Price instead of Doom Blade, I was originally going to include Go for the Throat so that artifacts couldn't be targeted (to illustrate cards that can't target everything) but saw the price

Commander decks in Magic: The Gathering took a turn for the terrifying with the release of Duskmourn: House of Horror

then, on each of the controller's turns, they can cast target Zombie creature card from the graveyard to the battlefield

Serialized Doctor Who MTG Cards Each of the 13 Doctor cards receives a serialized treatment in the Doctor Who set

I think it was more of a craft than an art