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It cant be substituted for another creature

But...it's also a 5 mana card that doesn't add to the board, and it only gives you that 4-for-1 when the contents of your graveyard are exactly right

until the end of this turn, that target loses 600 ATK, but cannot be targeted or destroyed by other card effects

Knight of Hanoi POINT: Send Face-Up Equip Cards To The GY The third effect of God Phoenix Gearfried lets you send cards treated as Equip Spell Cards equipped to Gizmek Mikazuchi, the Nuclear Emperor and Dragunity Arma Leyvaten by the effects, by sending to the GY, allowing you negate the effects of the opponents monsters and destroy them

This also leads me to the very first 1st edition Pokmon TCG cards: Japanese No Rarity Base Set: Unlike later print runs, the Japanese Base Set has no 1st edition symbol to indicate that its 1st edition

It is also a drawback that it will rot without a Fusion Monster