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

While normally treasures are sacrificed to provide mana, Galazeth allows artifacts to be tapped to produce one mana of any color though this mana can only be used to cast instants and sorceries

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

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

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