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Although on the surface it doesnt seem all that amazing, when paired with Kingdra LA, it becomes a beast

* Decrease the level of the selected monster by 2

C Common Cyber Gymnast X EARTH Level 4 [ WarriorEffect ] ATK 800 DEF 1800 Once per turn: You can discard 1 card, then target 1 Attack Position monster your opponent controls

Some cards with this treatment include Anzrag, the Quake-Mole and Etrata, Deadly Fugitive

The result is an endless supply of Rock equipment artifacts

The search route is this card Libromancer First Appearance Libromancer Fire Libromancer Magigirl If you have a Ritual Monster and this card or Emergency Teleport, you can Special Summon and search from there