Worm Millidith

Level 4 LIGHT/Reptile Flip Effect
400 ATK / 1600 DEF

FLIP: You can equip this card to a monster your opponent controls as an Equip Card. Inflict 400 damage to the controller of the equipped monster during each Standby Phase.

Rulings – Yugipedia

Printings:

Duel Terminal 2: DT02-EN030 (Duel Terminal Normal Parallel Rare) - 2010-05-25
Hidden Arsenal 2: HA02-EN024 (Super Rare) - 2010-07-15

Prices:

Cardmarket: 0.19 €
TCGplayer: $ 0.11