This is a FOIL Artist Proof for the card, Festering Mummy, from the Magic the Gathering set, Amonkhet
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Some effects of monster cards can be activated during the damage step on the field that do not alter attack or defense points, but there are limited monster cards with effects that do not alter attack or defense points that can be activated on the field during the damage step (one example of an effect monster card that can activate its effect on the field during the damage step that does not alter attack or defense points is Totem Bird)
it can make a second attack during each Battle Phase this turn
Though the gameplay mechanics are yet to be fully revealed, the titles publisher Ravensburger a studio best known for publishing board games, rather than TCGs has promised thoughtful and unique gameplay
If the new artifacts mana value is the same or lower, you dont have to do anything else
