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Machine King Prototype X EARTH Level 3 [ Machine / Effect ] ATK 1600 DEF 1500 This card gains 100 ATK and DEF for each Machine-Type monster on the field, except this card

During your Main Phase: You can equip 1 appropriate LIGHT Machine Union monster from your Deck to this card as an Equip Spell as if it were equipped by that monster's effect, also you cannot Special Summon from the Extra Deck for the rest of this turn, except LIGHT monsters

Commanders like Sidisi, Brood Tyrant, and Teval, the Balanced Scale, for instance, consistently fuel The Immortal Coils activated ability

That means it's best for more experienced TCG players