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You can simply use it whenever you like, get two basic Psychic energy cards from the discard pile, and attach them to this Mewtwo

A deck focused on graveyard recursion and reanimation would benefit the most from including Boneyard Parley, as it allows for a powerful swing in board presence by potentially bringing multiple creatures back onto the battlefield

Yes, this card will make those lands lose all other abilities

To mitigate the requirement of dealing combat damage for the Goad effect, Komainu Battle Armor even has, or gives an equipped creature, Menace

You want this in a low-land-count deck with several Zombie synergies and pump effects

Pretty sure the cards are bootleg, which is maybe why the origin is so unclear