Generaider Boss Room

Continuous Trap

When your opponent activates a card or effect in response to the activation of your "Generaider" card or effect: You can discard 1 card; your opponent's activated effect becomes "each player draws 1 card". You can only use this effect of "Generaider Boss Room" once per turn.

Rulings – Yugipedia

Printings:

Mystic Fighters: MYFI-EN038 (Super Rare) - 2019-11-22

Prices:

Cardmarket: 0.22 €
TCGplayer: $ 0.42