Medusa Worm

Level 2 EARTH/Rock Effect
500 ATK / 600 DEF

Once per turn, you can flip this card into face-down Defense Position. When this card is Flip Summoned, destroy 1 monster on your opponent's side of the field.

Rulings – Yugipedia

Printings:

The Lost Millennium: TLM-EN022 (Common) - 2005-06-01
Structure Deck: Invincible Fortress: SD7-EN014 (Common) - 2006-05-15
Dark Revelation Volume 3: DR3-EN202 (Common) - 2006-11-25

Prices:

Cardmarket: 0.12 €
TCGplayer: $ 0.21